./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-lopstr16/break-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 527bcce2 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_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-lopstr16/break-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5 --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 af12e42a5d3a022d66b7920ff01dec158b3de4df470747e943653bc7f1da2cc9 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 19:03:22,570 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:03:22,655 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-21 19:03:22,661 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:03:22,661 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:03:22,687 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:03:22,688 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:03:22,688 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:03:22,689 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:03:22,690 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:03:22,690 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:03:22,691 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:03:22,692 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:03:22,692 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:03:22,693 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:03:22,693 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:03:22,694 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:03:22,695 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:03:22,695 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:03:22,696 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:03:22,696 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:03:22,697 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:03:22,698 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:03:22,698 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 19:03:22,699 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:03:22,699 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:03:22,699 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:03:22,700 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:03:22,700 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 19:03:22,701 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:03:22,701 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 19:03:22,701 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:03:22,702 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 19:03:22,702 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:03:22,702 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:03:22,703 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:03:22,703 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:03:22,703 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:03:22,703 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:03:22,704 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:03:22,704 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 19:03:22,704 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:03:22,704 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:03:22,705 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:03:22,705 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 19:03:22,705 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:03:22,705 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:03:22,705 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_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> af12e42a5d3a022d66b7920ff01dec158b3de4df470747e943653bc7f1da2cc9 [2023-11-21 19:03:22,964 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:03:22,999 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:03:23,004 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:03:23,007 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:03:23,008 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:03:23,009 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/array-lopstr16/break-2.i [2023-11-21 19:03:26,096 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:03:26,300 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:03:26,301 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/sv-benchmarks/c/array-lopstr16/break-2.i [2023-11-21 19:03:26,308 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/data/7a3b564fa/3a414db4ff3f4a8997ec832d7ba6b4d4/FLAG52e06225f [2023-11-21 19:03:26,320 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/data/7a3b564fa/3a414db4ff3f4a8997ec832d7ba6b4d4 [2023-11-21 19:03:26,323 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:03:26,325 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:03:26,336 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:03:26,337 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:03:26,342 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:03:26,343 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:03:26" (1/1) ... [2023-11-21 19:03:26,344 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d64a566 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:26, skipping insertion in model container [2023-11-21 19:03:26,345 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:03:26" (1/1) ... [2023-11-21 19:03:26,369 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:03:26,593 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_09c751bc-d254-4622-beb8-89a4b8b77bf9/sv-benchmarks/c/array-lopstr16/break-2.i[800,813] [2023-11-21 19:03:26,609 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:03:34,240 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:03:34,255 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_09c751bc-d254-4622-beb8-89a4b8b77bf9/sv-benchmarks/c/array-lopstr16/break-2.i[800,813] [2023-11-21 19:03:34,260 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:03:34,277 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:03:34,277 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:34 WrapperNode [2023-11-21 19:03:34,277 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:03:34,278 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:03:34,278 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:03:34,279 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:03:34,287 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:34" (1/1) ... [2023-11-21 19:03:34,295 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:34" (1/1) ... [2023-11-21 19:03:34,313 INFO L138 Inliner]: procedures = 14, calls = 10, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 42 [2023-11-21 19:03:34,314 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:03:34,314 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:03:34,315 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:03:34,315 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:03:34,325 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:34" (1/1) ... [2023-11-21 19:03:34,325 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:34" (1/1) ... [2023-11-21 19:03:34,327 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:34" (1/1) ... [2023-11-21 19:03:34,327 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:34" (1/1) ... [2023-11-21 19:03:34,332 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:34" (1/1) ... [2023-11-21 19:03:34,336 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:34" (1/1) ... [2023-11-21 19:03:34,337 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:34" (1/1) ... [2023-11-21 19:03:34,338 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:34" (1/1) ... [2023-11-21 19:03:34,340 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:03:34,341 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:03:34,341 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:03:34,341 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:03:34,342 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:34" (1/1) ... [2023-11-21 19:03:34,349 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:03:34,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:34,376 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:03:34,671 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:03:34,699 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:03:34,699 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:03:34,700 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-21 19:03:34,700 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:03:34,702 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:03:34,702 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-21 19:03:34,799 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:03:34,804 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:03:34,991 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:03:35,035 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:03:35,035 INFO L308 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-21 19:03:35,037 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:03:35 BoogieIcfgContainer [2023-11-21 19:03:35,037 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:03:35,041 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:03:35,041 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:03:35,044 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:03:35,045 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:03:26" (1/3) ... [2023-11-21 19:03:35,047 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ad1974a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:03:35, skipping insertion in model container [2023-11-21 19:03:35,047 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:03:34" (2/3) ... [2023-11-21 19:03:35,049 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ad1974a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:03:35, skipping insertion in model container [2023-11-21 19:03:35,049 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:03:35" (3/3) ... [2023-11-21 19:03:35,050 INFO L112 eAbstractionObserver]: Analyzing ICFG break-2.i [2023-11-21 19:03:35,071 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:03:35,071 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-21 19:03:35,130 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:03:35,139 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;@15f1893e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:03:35,140 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-21 19:03:35,145 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:03:35,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-21 19:03:35,153 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:35,154 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:35,154 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:35,163 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:35,163 INFO L85 PathProgramCache]: Analyzing trace with hash 696685750, now seen corresponding path program 1 times [2023-11-21 19:03:35,174 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:35,175 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [979179831] [2023-11-21 19:03:35,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:35,176 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:35,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:35,450 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:35,450 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:35,451 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [979179831] [2023-11-21 19:03:35,451 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [979179831] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:35,452 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:03:35,452 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 19:03:35,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205672518] [2023-11-21 19:03:35,455 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:35,459 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:03:35,461 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:35,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:03:35,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:03:35,502 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:03:35,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:35,589 INFO L93 Difference]: Finished difference Result 30 states and 41 transitions. [2023-11-21 19:03:35,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:03:35,593 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-21 19:03:35,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:35,601 INFO L225 Difference]: With dead ends: 30 [2023-11-21 19:03:35,601 INFO L226 Difference]: Without dead ends: 20 [2023-11-21 19:03:35,605 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 [2023-11-21 19:03:35,611 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 7 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:35,613 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 11 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:03:35,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-21 19:03:35,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 15. [2023-11-21 19:03:35,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:03:35,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-11-21 19:03:35,647 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 7 [2023-11-21 19:03:35,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:35,647 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-11-21 19:03:35,648 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:03:35,648 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-11-21 19:03:35,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-21 19:03:35,648 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:35,649 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:35,649 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 19:03:35,649 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:35,650 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:35,650 INFO L85 PathProgramCache]: Analyzing trace with hash 154855781, now seen corresponding path program 1 times [2023-11-21 19:03:35,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:35,650 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [515551358] [2023-11-21 19:03:35,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:35,651 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:35,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:35,732 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:35,733 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:35,733 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [515551358] [2023-11-21 19:03:35,733 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [515551358] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:03:35,734 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017714327] [2023-11-21 19:03:35,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:35,734 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:35,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:35,737 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:03:35,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:03:35,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:35,801 INFO L262 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-21 19:03:35,806 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:03:35,852 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:35,852 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:03:35,878 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:35,878 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017714327] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:03:35,878 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1035701015] [2023-11-21 19:03:35,899 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-21 19:03:35,899 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:03:35,902 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:03:35,908 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:03:35,909 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:03:36,383 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:03:36,435 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1035701015] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:03:36,435 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:03:36,435 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 3] total 8 [2023-11-21 19:03:36,439 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448270493] [2023-11-21 19:03:36,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:03:36,440 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:03:36,440 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:36,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:03:36,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2023-11-21 19:03:36,442 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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) [2023-11-21 19:03:36,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:36,481 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2023-11-21 19:03:36,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:03:36,482 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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 9 [2023-11-21 19:03:36,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:36,483 INFO L225 Difference]: With dead ends: 26 [2023-11-21 19:03:36,483 INFO L226 Difference]: Without dead ends: 16 [2023-11-21 19:03:36,484 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2023-11-21 19:03:36,487 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 18 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:36,488 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 5 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:03:36,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-21 19:03:36,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2023-11-21 19:03:36,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:03:36,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2023-11-21 19:03:36,504 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2023-11-21 19:03:36,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:36,505 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2023-11-21 19:03:36,505 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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) [2023-11-21 19:03:36,505 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2023-11-21 19:03:36,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-21 19:03:36,507 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:36,507 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:36,529 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 19:03:36,728 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-11-21 19:03:36,729 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:36,729 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:36,729 INFO L85 PathProgramCache]: Analyzing trace with hash 618544530, now seen corresponding path program 1 times [2023-11-21 19:03:36,729 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:36,730 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1783793195] [2023-11-21 19:03:36,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:36,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:36,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:36,837 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:36,837 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:36,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1783793195] [2023-11-21 19:03:36,841 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1783793195] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:03:36,842 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593796119] [2023-11-21 19:03:36,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:36,842 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:36,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:36,849 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:03:36,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:03:36,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:36,915 INFO L262 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-21 19:03:36,916 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:03:36,942 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:36,943 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:03:36,971 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:36,972 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1593796119] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:03:36,972 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [168463071] [2023-11-21 19:03:36,980 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-21 19:03:36,980 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:03:36,981 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:03:36,981 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:03:36,981 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:03:37,291 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:03:37,438 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '241#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~i~0#1| 0) (= |~#s~0.base| 3) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| 3) 0)) (= |~#s~0.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (not (= |ULTIMATE.start_main_#t~mem3#1| 10)))' at error location [2023-11-21 19:03:37,438 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:03:37,438 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:03:37,438 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-21 19:03:37,439 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969244634] [2023-11-21 19:03:37,439 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:03:37,439 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 19:03:37,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:37,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 19:03:37,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2023-11-21 19:03:37,441 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:03:37,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:37,523 INFO L93 Difference]: Finished difference Result 53 states and 62 transitions. [2023-11-21 19:03:37,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:03:37,524 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-21 19:03:37,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:37,525 INFO L225 Difference]: With dead ends: 53 [2023-11-21 19:03:37,525 INFO L226 Difference]: Without dead ends: 43 [2023-11-21 19:03:37,525 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2023-11-21 19:03:37,527 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 30 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:37,528 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 23 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:03:37,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-11-21 19:03:37,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 36. [2023-11-21 19:03:37,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 35 states have internal predecessors, (41), 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) [2023-11-21 19:03:37,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2023-11-21 19:03:37,537 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 10 [2023-11-21 19:03:37,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:37,538 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2023-11-21 19:03:37,538 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:03:37,538 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2023-11-21 19:03:37,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-21 19:03:37,539 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:37,539 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:37,564 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:03:37,762 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:37,762 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:37,763 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:37,763 INFO L85 PathProgramCache]: Analyzing trace with hash -451145819, now seen corresponding path program 2 times [2023-11-21 19:03:37,763 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:37,763 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1660341803] [2023-11-21 19:03:37,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:37,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:37,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:37,899 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:37,900 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:37,900 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1660341803] [2023-11-21 19:03:37,900 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1660341803] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:03:37,900 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [122665966] [2023-11-21 19:03:37,901 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:03:37,901 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:37,901 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:37,902 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:03:37,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:03:37,981 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-11-21 19:03:37,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:03:37,982 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-21 19:03:37,985 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:03:38,025 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:38,026 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:03:38,102 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:38,103 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [122665966] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:03:38,103 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1727816407] [2023-11-21 19:03:38,106 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-21 19:03:38,106 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:03:38,106 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:03:38,107 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:03:38,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:03:38,314 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:03:38,460 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '461#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~i~0#1| 0) (= |~#s~0.base| 3) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| 3) 0)) (= |~#s~0.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (not (= |ULTIMATE.start_main_#t~mem3#1| 10)))' at error location [2023-11-21 19:03:38,460 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:03:38,460 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:03:38,460 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-11-21 19:03:38,461 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045619140] [2023-11-21 19:03:38,461 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:03:38,462 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-21 19:03:38,462 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:38,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-21 19:03:38,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=208, Unknown=0, NotChecked=0, Total=342 [2023-11-21 19:03:38,464 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 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) [2023-11-21 19:03:38,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:38,637 INFO L93 Difference]: Finished difference Result 122 states and 140 transitions. [2023-11-21 19:03:38,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-21 19:03:38,638 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 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) Word has length 16 [2023-11-21 19:03:38,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:38,640 INFO L225 Difference]: With dead ends: 122 [2023-11-21 19:03:38,640 INFO L226 Difference]: Without dead ends: 97 [2023-11-21 19:03:38,641 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=134, Invalid=208, Unknown=0, NotChecked=0, Total=342 [2023-11-21 19:03:38,642 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 150 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:38,643 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 43 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:03:38,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2023-11-21 19:03:38,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 78. [2023-11-21 19:03:38,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.155844155844156) internal successors, (89), 77 states have internal predecessors, (89), 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) [2023-11-21 19:03:38,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 89 transitions. [2023-11-21 19:03:38,662 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 89 transitions. Word has length 16 [2023-11-21 19:03:38,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:38,662 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 89 transitions. [2023-11-21 19:03:38,662 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 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) [2023-11-21 19:03:38,663 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 89 transitions. [2023-11-21 19:03:38,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-21 19:03:38,664 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:38,664 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:38,689 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 19:03:38,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:38,865 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:38,865 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:38,865 INFO L85 PathProgramCache]: Analyzing trace with hash 152507659, now seen corresponding path program 3 times [2023-11-21 19:03:38,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:38,866 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201449449] [2023-11-21 19:03:38,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:38,866 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:38,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:39,190 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:39,190 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:39,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201449449] [2023-11-21 19:03:39,190 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1201449449] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:03:39,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [240183905] [2023-11-21 19:03:39,191 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-21 19:03:39,191 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:39,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:39,192 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:03:39,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 19:03:39,290 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-21 19:03:39,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:03:39,292 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-21 19:03:39,295 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:03:39,358 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:39,359 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:03:39,686 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:39,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [240183905] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:03:39,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [993272357] [2023-11-21 19:03:39,691 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-21 19:03:39,691 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:03:39,692 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:03:39,692 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:03:39,692 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:03:40,100 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:03:40,257 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '903#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~i~0#1| 0) (= |~#s~0.base| 3) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| 3) 0)) (= |~#s~0.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (not (= |ULTIMATE.start_main_#t~mem3#1| 10)))' at error location [2023-11-21 19:03:40,257 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:03:40,257 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:03:40,257 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2023-11-21 19:03:40,258 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174719909] [2023-11-21 19:03:40,258 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:03:40,260 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-21 19:03:40,260 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:40,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-21 19:03:40,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=392, Invalid=538, Unknown=0, NotChecked=0, Total=930 [2023-11-21 19:03:40,265 INFO L87 Difference]: Start difference. First operand 78 states and 89 transitions. Second operand has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 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) [2023-11-21 19:03:40,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:40,592 INFO L93 Difference]: Finished difference Result 260 states and 296 transitions. [2023-11-21 19:03:40,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-21 19:03:40,593 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 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) Word has length 28 [2023-11-21 19:03:40,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:40,595 INFO L225 Difference]: With dead ends: 260 [2023-11-21 19:03:40,595 INFO L226 Difference]: Without dead ends: 205 [2023-11-21 19:03:40,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=392, Invalid=538, Unknown=0, NotChecked=0, Total=930 [2023-11-21 19:03:40,597 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 378 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 378 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:40,598 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [378 Valid, 95 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:03:40,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2023-11-21 19:03:40,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 162. [2023-11-21 19:03:40,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 161 states have (on average 1.1490683229813665) internal successors, (185), 161 states have internal predecessors, (185), 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) [2023-11-21 19:03:40,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 185 transitions. [2023-11-21 19:03:40,624 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 185 transitions. Word has length 28 [2023-11-21 19:03:40,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:40,624 INFO L495 AbstractCegarLoop]: Abstraction has 162 states and 185 transitions. [2023-11-21 19:03:40,625 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 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) [2023-11-21 19:03:40,625 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 185 transitions. [2023-11-21 19:03:40,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-11-21 19:03:40,627 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:40,627 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:40,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 19:03:40,848 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:40,848 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:40,848 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:40,849 INFO L85 PathProgramCache]: Analyzing trace with hash -475929385, now seen corresponding path program 4 times [2023-11-21 19:03:40,849 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:40,849 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [992476879] [2023-11-21 19:03:40,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:40,849 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:40,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:41,754 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:41,754 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:41,756 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [992476879] [2023-11-21 19:03:41,757 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [992476879] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:03:41,757 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1255665923] [2023-11-21 19:03:41,757 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-21 19:03:41,757 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:41,758 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:41,759 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:03:41,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 19:03:41,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:41,862 INFO L262 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-21 19:03:41,866 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:03:41,979 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:41,979 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:03:42,912 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:42,913 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1255665923] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:03:42,913 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1844383124] [2023-11-21 19:03:42,915 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-21 19:03:42,915 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:03:42,915 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:03:42,916 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:03:42,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:03:43,105 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:03:43,288 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1789#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~i~0#1| 0) (= |~#s~0.base| 3) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| 3) 0)) (= |~#s~0.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (not (= |ULTIMATE.start_main_#t~mem3#1| 10)))' at error location [2023-11-21 19:03:43,288 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:03:43,288 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:03:43,288 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2023-11-21 19:03:43,289 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489943562] [2023-11-21 19:03:43,289 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:03:43,291 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-11-21 19:03:43,291 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:03:43,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-11-21 19:03:43,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1340, Invalid=1630, Unknown=0, NotChecked=0, Total=2970 [2023-11-21 19:03:43,298 INFO L87 Difference]: Start difference. First operand 162 states and 185 transitions. Second operand has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 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) [2023-11-21 19:03:44,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:03:44,142 INFO L93 Difference]: Finished difference Result 536 states and 608 transitions. [2023-11-21 19:03:44,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-11-21 19:03:44,143 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 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 52 [2023-11-21 19:03:44,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:03:44,146 INFO L225 Difference]: With dead ends: 536 [2023-11-21 19:03:44,146 INFO L226 Difference]: Without dead ends: 421 [2023-11-21 19:03:44,149 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 580 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1340, Invalid=1630, Unknown=0, NotChecked=0, Total=2970 [2023-11-21 19:03:44,150 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 888 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 888 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 424 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-21 19:03:44,150 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [888 Valid, 191 Invalid, 424 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-21 19:03:44,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2023-11-21 19:03:44,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 330. [2023-11-21 19:03:44,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 329 states have (on average 1.1458966565349544) internal successors, (377), 329 states have internal predecessors, (377), 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) [2023-11-21 19:03:44,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 377 transitions. [2023-11-21 19:03:44,191 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 377 transitions. Word has length 52 [2023-11-21 19:03:44,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:03:44,192 INFO L495 AbstractCegarLoop]: Abstraction has 330 states and 377 transitions. [2023-11-21 19:03:44,200 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 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) [2023-11-21 19:03:44,200 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 377 transitions. [2023-11-21 19:03:44,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2023-11-21 19:03:44,204 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:03:44,204 INFO L195 NwaCegarLoop]: trace histogram [47, 46, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:03:44,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-21 19:03:44,405 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:44,405 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:03:44,406 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:03:44,406 INFO L85 PathProgramCache]: Analyzing trace with hash 1755617391, now seen corresponding path program 5 times [2023-11-21 19:03:44,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:03:44,407 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575522885] [2023-11-21 19:03:44,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:03:44,407 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:03:44,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:03:46,715 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:03:46,716 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:03:46,716 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575522885] [2023-11-21 19:03:46,716 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575522885] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:03:46,716 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1266395935] [2023-11-21 19:03:46,716 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:03:46,716 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:03:46,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:03:46,721 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:03:46,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09c751bc-d254-4622-beb8-89a4b8b77bf9/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process