./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_copy7_ground-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/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_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_copy7_ground-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/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_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/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 46307615818d6371ae296fa4995def50a9373bd159748713204d6c22dd4af97e --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:19:26,203 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:19:26,334 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:19:26,342 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:19:26,343 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:19:26,371 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:19:26,372 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:19:26,372 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:19:26,373 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:19:26,374 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:19:26,375 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:19:26,375 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:19:26,376 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:19:26,377 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:19:26,377 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:19:26,378 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:19:26,379 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:19:26,379 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:19:26,380 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:19:26,381 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:19:26,381 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:19:26,382 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:19:26,383 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:19:26,384 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:19:26,384 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:19:26,385 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:19:26,385 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:19:26,386 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:19:26,386 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:19:26,387 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:19:26,387 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:19:26,388 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:19:26,388 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:19:26,388 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:19:26,389 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:19:26,389 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:19:26,389 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:19:26,390 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:19:26,390 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:19:26,391 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:19:26,391 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:19:26,391 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:19:26,392 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:19:26,392 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:19:26,392 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:19:26,392 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:19:26,393 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:19:26,393 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_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 46307615818d6371ae296fa4995def50a9373bd159748713204d6c22dd4af97e [2023-11-23 21:19:26,737 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:19:26,770 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:19:26,773 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:19:26,775 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:19:26,776 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:19:26,777 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/array-examples/standard_copy7_ground-1.i [2023-11-23 21:19:29,998 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:19:30,256 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:19:30,256 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/sv-benchmarks/c/array-examples/standard_copy7_ground-1.i [2023-11-23 21:19:30,266 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/data/83fe02bed/4f1bd36fdd494d9392bcb1ff7a03befe/FLAG23a6e8d98 [2023-11-23 21:19:30,286 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/data/83fe02bed/4f1bd36fdd494d9392bcb1ff7a03befe [2023-11-23 21:19:30,289 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:19:30,292 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:19:30,294 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:19:30,294 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:19:30,301 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:19:30,302 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:19:30" (1/1) ... [2023-11-23 21:19:30,304 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@313595ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:30, skipping insertion in model container [2023-11-23 21:19:30,304 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:19:30" (1/1) ... [2023-11-23 21:19:30,333 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:19:30,526 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_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/sv-benchmarks/c/array-examples/standard_copy7_ground-1.i[816,829] [2023-11-23 21:19:30,566 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:19:30,578 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:19:30,590 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_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/sv-benchmarks/c/array-examples/standard_copy7_ground-1.i[816,829] [2023-11-23 21:19:30,609 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:19:30,628 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:19:30,629 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:30 WrapperNode [2023-11-23 21:19:30,629 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:19:30,630 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:19:30,631 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:19:30,631 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:19:30,640 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:30" (1/1) ... [2023-11-23 21:19:30,649 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:30" (1/1) ... [2023-11-23 21:19:30,687 INFO L138 Inliner]: procedures = 16, calls = 49, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 164 [2023-11-23 21:19:30,687 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:19:30,688 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:19:30,688 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:19:30,689 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:19:30,701 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:30" (1/1) ... [2023-11-23 21:19:30,702 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:30" (1/1) ... [2023-11-23 21:19:30,706 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:30" (1/1) ... [2023-11-23 21:19:30,706 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:30" (1/1) ... [2023-11-23 21:19:30,719 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:30" (1/1) ... [2023-11-23 21:19:30,726 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:30" (1/1) ... [2023-11-23 21:19:30,729 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:30" (1/1) ... [2023-11-23 21:19:30,730 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:30" (1/1) ... [2023-11-23 21:19:30,734 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:19:30,736 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:19:30,736 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:19:30,736 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:19:30,737 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:30" (1/1) ... [2023-11-23 21:19:30,745 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:19:30,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:30,786 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:19:30,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:19:30,849 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:19:30,849 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:19:30,850 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:19:30,850 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:19:30,850 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:19:30,850 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:19:30,851 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:19:30,851 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:19:30,953 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:19:30,956 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:19:31,308 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:19:31,442 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:19:31,446 INFO L309 CfgBuilder]: Removed 9 assume(true) statements. [2023-11-23 21:19:31,448 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:19:31 BoogieIcfgContainer [2023-11-23 21:19:31,448 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:19:31,479 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:19:31,479 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:19:31,485 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:19:31,485 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:19:30" (1/3) ... [2023-11-23 21:19:31,486 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7073afb2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:19:31, skipping insertion in model container [2023-11-23 21:19:31,490 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:19:30" (2/3) ... [2023-11-23 21:19:31,493 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7073afb2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:19:31, skipping insertion in model container [2023-11-23 21:19:31,494 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:19:31" (3/3) ... [2023-11-23 21:19:31,495 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_copy7_ground-1.i [2023-11-23 21:19:31,521 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:19:31,522 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:19:31,591 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:19:31,598 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;@35f27ae7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:19:31,599 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:19:31,605 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 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 21:19:31,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-23 21:19:31,613 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:31,614 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:31,615 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:19:31,626 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:31,627 INFO L85 PathProgramCache]: Analyzing trace with hash -175839371, now seen corresponding path program 1 times [2023-11-23 21:19:31,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:31,637 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780475670] [2023-11-23 21:19:31,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:31,638 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:31,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:31,990 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 21:19:31,990 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:31,991 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1780475670] [2023-11-23 21:19:31,992 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1780475670] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:31,992 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:19:31,992 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:19:31,993 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362427377] [2023-11-23 21:19:31,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:31,998 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:19:31,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:32,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:19:32,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:19:32,057 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 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 21:19:32,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:32,159 INFO L93 Difference]: Finished difference Result 29 states and 47 transitions. [2023-11-23 21:19:32,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:19:32,162 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 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 12 [2023-11-23 21:19:32,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:32,170 INFO L225 Difference]: With dead ends: 29 [2023-11-23 21:19:32,170 INFO L226 Difference]: Without dead ends: 15 [2023-11-23 21:19:32,173 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 21:19:32,177 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:32,179 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:19:32,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-23 21:19:32,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-23 21:19:32,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 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 21:19:32,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 23 transitions. [2023-11-23 21:19:32,212 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 23 transitions. Word has length 12 [2023-11-23 21:19:32,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:32,212 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 23 transitions. [2023-11-23 21:19:32,213 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 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 21:19:32,213 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 23 transitions. [2023-11-23 21:19:32,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-23 21:19:32,214 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:32,214 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:32,214 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:19:32,215 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:19:32,216 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:32,216 INFO L85 PathProgramCache]: Analyzing trace with hash -1190607641, now seen corresponding path program 1 times [2023-11-23 21:19:32,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:32,216 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041164584] [2023-11-23 21:19:32,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:32,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:32,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:32,419 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 21:19:32,419 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:32,419 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041164584] [2023-11-23 21:19:32,420 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1041164584] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:32,420 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1628977693] [2023-11-23 21:19:32,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:32,420 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:32,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:32,422 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:32,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:19:32,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:32,523 INFO L262 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:19:32,527 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:32,547 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:19:32,547 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:19:32,548 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1628977693] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:19:32,548 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:19:32,548 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2023-11-23 21:19:32,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021033885] [2023-11-23 21:19:32,549 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:19:32,550 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:19:32,550 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:32,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:19:32,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:19:32,552 INFO L87 Difference]: Start difference. First operand 15 states and 23 transitions. Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:32,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:32,607 INFO L93 Difference]: Finished difference Result 33 states and 54 transitions. [2023-11-23 21:19:32,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:19:32,608 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-23 21:19:32,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:32,608 INFO L225 Difference]: With dead ends: 33 [2023-11-23 21:19:32,609 INFO L226 Difference]: Without dead ends: 22 [2023-11-23 21:19:32,609 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-23 21:19:32,611 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:32,611 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:19:32,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-23 21:19:32,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-11-23 21:19:32,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 21 states have internal predecessors, (30), 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 21:19:32,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 30 transitions. [2023-11-23 21:19:32,618 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 30 transitions. Word has length 13 [2023-11-23 21:19:32,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:32,618 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 30 transitions. [2023-11-23 21:19:32,619 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:32,619 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 30 transitions. [2023-11-23 21:19:32,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-23 21:19:32,620 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:32,620 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:32,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:19:32,831 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:32,832 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:19:32,833 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:32,833 INFO L85 PathProgramCache]: Analyzing trace with hash -442132525, now seen corresponding path program 1 times [2023-11-23 21:19:32,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:32,833 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845480938] [2023-11-23 21:19:32,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:32,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:32,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:32,975 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 21:19:32,975 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:32,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845480938] [2023-11-23 21:19:32,976 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845480938] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:32,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [379991954] [2023-11-23 21:19:32,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:32,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:32,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:32,978 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:32,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:19:33,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:33,108 INFO L262 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 21:19:33,117 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:33,154 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 21:19:33,155 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:19:33,187 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 21:19:33,187 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [379991954] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:19:33,188 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [625783645] [2023-11-23 21:19:33,213 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 21:19:33,213 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:19:33,217 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:19:33,222 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:19:33,223 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:19:35,411 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:19:35,965 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '351#(and (= |ULTIMATE.start_main_~#a5~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem20#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a8~0#1.base|) 0)) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#a8~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) 0) |ULTIMATE.start_main_#t~mem19#1|) (<= 2 |ULTIMATE.start_main_~#a5~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a2~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a6~0#1.base|) (= |ULTIMATE.start_main_~#a6~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a4~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem19#1| |ULTIMATE.start_main_#t~mem20#1|)) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start_main_~#a8~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a7~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~#a7~0#1.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-23 21:19:35,965 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:19:35,966 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:19:35,966 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-23 21:19:35,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240116418] [2023-11-23 21:19:35,967 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:19:35,967 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:19:35,968 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:35,968 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:19:35,969 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2023-11-23 21:19:35,969 INFO L87 Difference]: Start difference. First operand 22 states and 30 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:36,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:36,039 INFO L93 Difference]: Finished difference Result 44 states and 62 transitions. [2023-11-23 21:19:36,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:19:36,039 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2023-11-23 21:19:36,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:36,040 INFO L225 Difference]: With dead ends: 44 [2023-11-23 21:19:36,040 INFO L226 Difference]: Without dead ends: 25 [2023-11-23 21:19:36,041 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2023-11-23 21:19:36,042 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:36,043 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:19:36,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-23 21:19:36,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-11-23 21:19:36,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.375) internal successors, (33), 24 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:36,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 33 transitions. [2023-11-23 21:19:36,048 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 33 transitions. Word has length 20 [2023-11-23 21:19:36,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:36,049 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 33 transitions. [2023-11-23 21:19:36,049 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:19:36,049 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 33 transitions. [2023-11-23 21:19:36,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-23 21:19:36,050 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:36,051 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:36,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:19:36,272 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:36,273 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:19:36,273 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:36,273 INFO L85 PathProgramCache]: Analyzing trace with hash 2006596869, now seen corresponding path program 2 times [2023-11-23 21:19:36,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:36,273 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561713791] [2023-11-23 21:19:36,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:36,274 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:36,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:36,414 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-23 21:19:36,414 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:36,414 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561713791] [2023-11-23 21:19:36,415 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561713791] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:36,415 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [720133760] [2023-11-23 21:19:36,415 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:19:36,415 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:36,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:36,417 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:36,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:19:36,532 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-23 21:19:36,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:19:36,534 INFO L262 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 21:19:36,536 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:36,553 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-23 21:19:36,553 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:19:36,570 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-23 21:19:36,570 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [720133760] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:19:36,571 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1784360414] [2023-11-23 21:19:36,576 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 21:19:36,576 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:19:36,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:19:36,578 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:19:36,578 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:19:37,837 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:19:38,436 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '619#(and (= |ULTIMATE.start_main_~#a5~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem20#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a8~0#1.base|) 0)) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#a8~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) 0) |ULTIMATE.start_main_#t~mem19#1|) (<= 2 |ULTIMATE.start_main_~#a5~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a2~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a6~0#1.base|) (= |ULTIMATE.start_main_~#a6~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a4~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem19#1| |ULTIMATE.start_main_#t~mem20#1|)) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start_main_~#a8~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a7~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~#a7~0#1.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-23 21:19:38,436 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:19:38,437 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:19:38,437 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-23 21:19:38,437 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669429567] [2023-11-23 21:19:38,437 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:19:38,438 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:19:38,438 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:38,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:19:38,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2023-11-23 21:19:38,439 INFO L87 Difference]: Start difference. First operand 25 states and 33 transitions. Second operand has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 7 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 21:19:38,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:38,591 INFO L93 Difference]: Finished difference Result 63 states and 98 transitions. [2023-11-23 21:19:38,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:19:38,592 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 7 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 23 [2023-11-23 21:19:38,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:38,593 INFO L225 Difference]: With dead ends: 63 [2023-11-23 21:19:38,593 INFO L226 Difference]: Without dead ends: 46 [2023-11-23 21:19:38,593 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2023-11-23 21:19:38,594 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:38,595 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:19:38,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-23 21:19:38,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-11-23 21:19:38,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 45 states have (on average 1.2) internal successors, (54), 45 states have internal predecessors, (54), 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 21:19:38,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2023-11-23 21:19:38,603 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 23 [2023-11-23 21:19:38,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:38,604 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2023-11-23 21:19:38,604 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 7 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 21:19:38,604 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2023-11-23 21:19:38,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-11-23 21:19:38,606 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:38,606 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:38,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:19:38,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:38,828 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:19:38,828 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:38,828 INFO L85 PathProgramCache]: Analyzing trace with hash -46215563, now seen corresponding path program 3 times [2023-11-23 21:19:38,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:38,829 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656651704] [2023-11-23 21:19:38,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:38,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:38,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:39,068 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-11-23 21:19:39,069 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:39,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656651704] [2023-11-23 21:19:39,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656651704] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:39,072 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2099359687] [2023-11-23 21:19:39,072 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:19:39,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:39,073 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:39,076 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:39,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:19:39,234 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:19:39,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:19:39,237 INFO L262 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 21:19:39,240 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:39,256 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-11-23 21:19:39,256 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:19:39,311 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-11-23 21:19:39,311 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2099359687] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:19:39,312 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [647407594] [2023-11-23 21:19:39,314 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 21:19:39,315 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:19:39,315 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:19:39,315 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:19:39,316 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:19:40,405 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:19:40,921 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1099#(and (= |ULTIMATE.start_main_~#a5~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem20#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a8~0#1.base|) 0)) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#a8~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) 0) |ULTIMATE.start_main_#t~mem19#1|) (<= 2 |ULTIMATE.start_main_~#a5~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a2~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a6~0#1.base|) (= |ULTIMATE.start_main_~#a6~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a4~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem19#1| |ULTIMATE.start_main_#t~mem20#1|)) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start_main_~#a8~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a7~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~#a7~0#1.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-23 21:19:40,921 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:19:40,921 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:19:40,922 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-11-23 21:19:40,922 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029022335] [2023-11-23 21:19:40,922 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:19:40,922 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-23 21:19:40,923 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:40,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-23 21:19:40,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=208, Unknown=0, NotChecked=0, Total=306 [2023-11-23 21:19:40,924 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 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 21:19:41,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:41,036 INFO L93 Difference]: Finished difference Result 92 states and 113 transitions. [2023-11-23 21:19:41,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-23 21:19:41,037 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 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 44 [2023-11-23 21:19:41,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:41,038 INFO L225 Difference]: With dead ends: 92 [2023-11-23 21:19:41,038 INFO L226 Difference]: Without dead ends: 52 [2023-11-23 21:19:41,039 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=98, Invalid=208, Unknown=0, NotChecked=0, Total=306 [2023-11-23 21:19:41,040 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:41,040 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:19:41,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-11-23 21:19:41,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2023-11-23 21:19:41,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.1764705882352942) internal successors, (60), 51 states have internal predecessors, (60), 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 21:19:41,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 60 transitions. [2023-11-23 21:19:41,049 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 60 transitions. Word has length 44 [2023-11-23 21:19:41,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:41,049 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 60 transitions. [2023-11-23 21:19:41,049 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 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 21:19:41,050 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 60 transitions. [2023-11-23 21:19:41,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-23 21:19:41,051 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:41,051 INFO L195 NwaCegarLoop]: trace histogram [10, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:41,079 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:19:41,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:41,268 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:19:41,268 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:41,268 INFO L85 PathProgramCache]: Analyzing trace with hash 2120427829, now seen corresponding path program 4 times [2023-11-23 21:19:41,268 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:41,269 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [568941625] [2023-11-23 21:19:41,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:41,269 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:41,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:41,724 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-11-23 21:19:41,724 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:41,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [568941625] [2023-11-23 21:19:41,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [568941625] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:41,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1041448899] [2023-11-23 21:19:41,725 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 21:19:41,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:41,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:41,727 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:41,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:19:41,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:41,917 INFO L262 TraceCheckSpWp]: Trace formula consists of 473 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-23 21:19:41,921 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:41,957 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-11-23 21:19:41,957 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:19:42,209 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-11-23 21:19:42,209 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1041448899] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:19:42,209 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1423843316] [2023-11-23 21:19:42,215 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 21:19:42,216 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:19:42,216 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:19:42,216 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:19:42,217 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:19:43,302 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:19:43,904 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1697#(and (= |ULTIMATE.start_main_~#a5~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem20#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a8~0#1.base|) 0)) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#a8~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) 0) |ULTIMATE.start_main_#t~mem19#1|) (<= 2 |ULTIMATE.start_main_~#a5~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a2~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a6~0#1.base|) (= |ULTIMATE.start_main_~#a6~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a4~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem19#1| |ULTIMATE.start_main_#t~mem20#1|)) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start_main_~#a8~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a7~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~#a7~0#1.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-23 21:19:43,904 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:19:43,904 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:19:43,905 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2023-11-23 21:19:43,905 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961752080] [2023-11-23 21:19:43,905 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:19:43,906 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-23 21:19:43,906 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:43,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-23 21:19:43,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=550, Unknown=0, NotChecked=0, Total=870 [2023-11-23 21:19:43,912 INFO L87 Difference]: Start difference. First operand 52 states and 60 transitions. Second operand has 25 states, 25 states have (on average 1.72) internal successors, (43), 24 states have internal predecessors, (43), 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 21:19:44,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:44,057 INFO L93 Difference]: Finished difference Result 104 states and 131 transitions. [2023-11-23 21:19:44,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-23 21:19:44,058 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.72) internal successors, (43), 24 states have internal predecessors, (43), 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 50 [2023-11-23 21:19:44,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:44,059 INFO L225 Difference]: With dead ends: 104 [2023-11-23 21:19:44,059 INFO L226 Difference]: Without dead ends: 64 [2023-11-23 21:19:44,060 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=320, Invalid=550, Unknown=0, NotChecked=0, Total=870 [2023-11-23 21:19:44,061 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:44,062 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:19:44,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-11-23 21:19:44,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2023-11-23 21:19:44,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 63 states have (on average 1.1428571428571428) internal successors, (72), 63 states have internal predecessors, (72), 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 21:19:44,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2023-11-23 21:19:44,072 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 50 [2023-11-23 21:19:44,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:44,072 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2023-11-23 21:19:44,073 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.72) internal successors, (43), 24 states have internal predecessors, (43), 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 21:19:44,073 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2023-11-23 21:19:44,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2023-11-23 21:19:44,075 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:44,075 INFO L195 NwaCegarLoop]: trace histogram [22, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:44,104 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:19:44,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:44,296 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:19:44,296 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:44,296 INFO L85 PathProgramCache]: Analyzing trace with hash 263892661, now seen corresponding path program 5 times [2023-11-23 21:19:44,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:44,297 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [798743739] [2023-11-23 21:19:44,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:44,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:44,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:45,408 INFO L134 CoverageAnalysis]: Checked inductivity of 323 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-11-23 21:19:45,408 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:45,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [798743739] [2023-11-23 21:19:45,408 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [798743739] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:45,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317922526] [2023-11-23 21:19:45,408 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:19:45,408 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:45,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:45,412 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:45,438 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:19:45,749 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-23 21:19:45,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:19:45,752 INFO L262 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 21:19:45,755 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:45,852 INFO L134 CoverageAnalysis]: Checked inductivity of 323 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 313 trivial. 0 not checked. [2023-11-23 21:19:45,852 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:19:45,966 INFO L134 CoverageAnalysis]: Checked inductivity of 323 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 313 trivial. 0 not checked. [2023-11-23 21:19:45,967 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [317922526] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:19:45,967 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1776253856] [2023-11-23 21:19:45,969 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 21:19:45,969 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:19:45,970 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:19:45,970 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:19:45,970 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:19:46,988 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:19:47,628 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2425#(and (= |ULTIMATE.start_main_~#a5~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem20#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a8~0#1.base|) 0)) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#a8~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) 0) |ULTIMATE.start_main_#t~mem19#1|) (<= 2 |ULTIMATE.start_main_~#a5~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a2~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a6~0#1.base|) (= |ULTIMATE.start_main_~#a6~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a4~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem19#1| |ULTIMATE.start_main_#t~mem20#1|)) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start_main_~#a8~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a7~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~#a7~0#1.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-23 21:19:47,629 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:19:47,629 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:19:47,629 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 7, 7] total 35 [2023-11-23 21:19:47,629 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567896691] [2023-11-23 21:19:47,629 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:19:47,630 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-11-23 21:19:47,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:47,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-11-23 21:19:47,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=385, Invalid=1175, Unknown=0, NotChecked=0, Total=1560 [2023-11-23 21:19:47,633 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand has 35 states, 35 states have (on average 1.6857142857142857) internal successors, (59), 35 states have internal predecessors, (59), 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 21:19:47,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:47,953 INFO L93 Difference]: Finished difference Result 147 states and 205 transitions. [2023-11-23 21:19:47,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-11-23 21:19:47,954 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.6857142857142857) internal successors, (59), 35 states have internal predecessors, (59), 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 62 [2023-11-23 21:19:47,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:47,955 INFO L225 Difference]: With dead ends: 147 [2023-11-23 21:19:47,956 INFO L226 Difference]: Without dead ends: 107 [2023-11-23 21:19:47,957 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 395 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=385, Invalid=1175, Unknown=0, NotChecked=0, Total=1560 [2023-11-23 21:19:47,958 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 223 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 370 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 223 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:47,958 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 370 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [223 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 21:19:47,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2023-11-23 21:19:47,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2023-11-23 21:19:47,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.0849056603773586) internal successors, (115), 106 states have internal predecessors, (115), 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 21:19:47,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 115 transitions. [2023-11-23 21:19:47,973 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 115 transitions. Word has length 62 [2023-11-23 21:19:47,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:47,974 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 115 transitions. [2023-11-23 21:19:47,974 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.6857142857142857) internal successors, (59), 35 states have internal predecessors, (59), 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 21:19:47,974 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 115 transitions. [2023-11-23 21:19:47,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2023-11-23 21:19:47,978 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:47,978 INFO L195 NwaCegarLoop]: trace histogram [23, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:48,006 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:19:48,191 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:48,192 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:19:48,192 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:48,192 INFO L85 PathProgramCache]: Analyzing trace with hash -1493990169, now seen corresponding path program 6 times [2023-11-23 21:19:48,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:48,193 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178827811] [2023-11-23 21:19:48,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:48,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:48,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:49,526 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2023-11-23 21:19:49,527 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:49,528 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178827811] [2023-11-23 21:19:49,528 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1178827811] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:49,528 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2113563825] [2023-11-23 21:19:49,528 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:19:49,528 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:49,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:49,530 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:49,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:19:49,879 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:19:49,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:19:49,885 INFO L262 TraceCheckSpWp]: Trace formula consists of 949 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-23 21:19:49,891 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:49,944 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2023-11-23 21:19:49,944 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:19:50,827 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2023-11-23 21:19:50,828 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2113563825] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:19:50,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1269185119] [2023-11-23 21:19:50,830 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 21:19:50,830 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:19:50,830 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:19:50,831 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:19:50,831 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:19:51,705 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:19:52,911 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3599#(and (= |ULTIMATE.start_main_~#a5~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem20#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a8~0#1.base|) 0)) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#a8~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) 0) |ULTIMATE.start_main_#t~mem19#1|) (<= 2 |ULTIMATE.start_main_~#a5~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a2~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a6~0#1.base|) (= |ULTIMATE.start_main_~#a6~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a4~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem19#1| |ULTIMATE.start_main_#t~mem20#1|)) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start_main_~#a8~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a7~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~#a7~0#1.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-23 21:19:52,911 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:19:52,924 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:19:52,925 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2023-11-23 21:19:52,926 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908830484] [2023-11-23 21:19:52,926 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:19:52,927 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-11-23 21:19:52,927 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:52,930 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-11-23 21:19:52,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1295, Invalid=1785, Unknown=0, NotChecked=0, Total=3080 [2023-11-23 21:19:52,933 INFO L87 Difference]: Start difference. First operand 107 states and 115 transitions. Second operand has 51 states, 51 states have (on average 1.3529411764705883) internal successors, (69), 50 states have internal predecessors, (69), 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 21:19:53,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:19:53,107 INFO L93 Difference]: Finished difference Result 214 states and 254 transitions. [2023-11-23 21:19:53,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2023-11-23 21:19:53,110 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.3529411764705883) internal successors, (69), 50 states have internal predecessors, (69), 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 105 [2023-11-23 21:19:53,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:19:53,115 INFO L225 Difference]: With dead ends: 214 [2023-11-23 21:19:53,115 INFO L226 Difference]: Without dead ends: 132 [2023-11-23 21:19:53,126 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 273 SyntacticMatches, 11 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1244 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1295, Invalid=1785, Unknown=0, NotChecked=0, Total=3080 [2023-11-23 21:19:53,127 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:19:53,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 179 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:19:53,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2023-11-23 21:19:53,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2023-11-23 21:19:53,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 131 states have (on average 1.0687022900763359) internal successors, (140), 131 states have internal predecessors, (140), 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 21:19:53,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 140 transitions. [2023-11-23 21:19:53,143 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 140 transitions. Word has length 105 [2023-11-23 21:19:53,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:19:53,144 INFO L495 AbstractCegarLoop]: Abstraction has 132 states and 140 transitions. [2023-11-23 21:19:53,144 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.3529411764705883) internal successors, (69), 50 states have internal predecessors, (69), 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 21:19:53,144 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 140 transitions. [2023-11-23 21:19:53,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2023-11-23 21:19:53,147 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:19:53,147 INFO L195 NwaCegarLoop]: trace histogram [48, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:19:53,175 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 21:19:53,360 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-23 21:19:53,360 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:19:53,361 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:19:53,361 INFO L85 PathProgramCache]: Analyzing trace with hash -810709067, now seen corresponding path program 7 times [2023-11-23 21:19:53,361 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:19:53,361 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1739601279] [2023-11-23 21:19:53,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:19:53,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:19:53,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:56,769 INFO L134 CoverageAnalysis]: Checked inductivity of 1561 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2023-11-23 21:19:56,769 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:56,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1739601279] [2023-11-23 21:19:56,770 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1739601279] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:56,771 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [20064318] [2023-11-23 21:19:56,772 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 21:19:56,772 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:56,772 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:56,773 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:56,795 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 21:19:57,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:57,250 INFO L262 TraceCheckSpWp]: Trace formula consists of 1299 conjuncts, 50 conjunts are in the unsatisfiable core [2023-11-23 21:19:57,255 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:57,372 INFO L134 CoverageAnalysis]: Checked inductivity of 1561 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2023-11-23 21:19:57,372 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:20:00,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1561 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2023-11-23 21:20:00,598 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [20064318] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:20:00,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1836055897] [2023-11-23 21:20:00,600 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 21:20:00,600 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:20:00,601 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:20:00,601 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:20:00,601 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:20:01,530 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:20:02,209 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5157#(and (= |ULTIMATE.start_main_~#a5~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem20#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a8~0#1.base|) 0)) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_main_~#a8~0#1.base|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a1~0#1.base|) 0) |ULTIMATE.start_main_#t~mem19#1|) (<= 2 |ULTIMATE.start_main_~#a5~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a2~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a3~0#1.base|) (= |ULTIMATE.start_main_~#a3~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a1~0#1.base|) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start_main_~#a1~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a6~0#1.base|) (= |ULTIMATE.start_main_~#a6~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a4~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem19#1| |ULTIMATE.start_main_#t~mem20#1|)) (= |ULTIMATE.start_main_~#a2~0#1.offset| 0) (= |ULTIMATE.start_main_~#a8~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#a7~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~#a7~0#1.offset| 0) (= |ULTIMATE.start_main_~#a4~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-11-23 21:20:02,210 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:20:02,210 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:20:02,210 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 100 [2023-11-23 21:20:02,210 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184530343] [2023-11-23 21:20:02,210 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:20:02,211 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2023-11-23 21:20:02,211 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:20:02,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2023-11-23 21:20:02,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5070, Invalid=6060, Unknown=0, NotChecked=0, Total=11130 [2023-11-23 21:20:02,218 INFO L87 Difference]: Start difference. First operand 132 states and 140 transitions. Second operand has 101 states, 101 states have (on average 1.1782178217821782) internal successors, (119), 100 states have internal predecessors, (119), 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 21:20:02,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:20:02,472 INFO L93 Difference]: Finished difference Result 264 states and 329 transitions. [2023-11-23 21:20:02,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2023-11-23 21:20:02,473 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.1782178217821782) internal successors, (119), 100 states have internal predecessors, (119), 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 130 [2023-11-23 21:20:02,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:20:02,474 INFO L225 Difference]: With dead ends: 264 [2023-11-23 21:20:02,475 INFO L226 Difference]: Without dead ends: 182 [2023-11-23 21:20:02,479 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 438 GetRequests, 334 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 927 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=5070, Invalid=6060, Unknown=0, NotChecked=0, Total=11130 [2023-11-23 21:20:02,480 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:20:02,481 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:20:02,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2023-11-23 21:20:02,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 182. [2023-11-23 21:20:02,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 181 states have (on average 1.0497237569060773) internal successors, (190), 181 states have internal predecessors, (190), 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 21:20:02,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 190 transitions. [2023-11-23 21:20:02,507 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 190 transitions. Word has length 130 [2023-11-23 21:20:02,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:20:02,508 INFO L495 AbstractCegarLoop]: Abstraction has 182 states and 190 transitions. [2023-11-23 21:20:02,508 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.1782178217821782) internal successors, (119), 100 states have internal predecessors, (119), 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 21:20:02,509 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 190 transitions. [2023-11-23 21:20:02,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2023-11-23 21:20:02,512 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:20:02,512 INFO L195 NwaCegarLoop]: trace histogram [98, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:20:02,528 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-23 21:20:02,716 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:20:02,717 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:20:02,717 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:20:02,717 INFO L85 PathProgramCache]: Analyzing trace with hash -1784077323, now seen corresponding path program 8 times [2023-11-23 21:20:02,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:20:02,718 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1192533489] [2023-11-23 21:20:02,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:20:02,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:20:03,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:20:12,388 INFO L134 CoverageAnalysis]: Checked inductivity of 5236 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2023-11-23 21:20:12,388 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:20:12,388 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1192533489] [2023-11-23 21:20:12,388 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1192533489] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:20:12,388 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1680404261] [2023-11-23 21:20:12,388 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:20:12,388 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:20:12,389 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:20:12,389 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:20:12,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a17d6e-fa0f-485e-a0d7-c51ed71d999b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process