./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_6.c --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_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/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_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_6.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/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_52f631be-2dc8-46c7-9c34-28f6cf4388e3/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 a0e1e4b700be1f29c3e51242b4a74b80feb10d65ba6788a48a42ab27b5c7017d --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 19:56:47,734 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:56:47,832 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-21 19:56:47,844 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:56:47,846 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:56:47,895 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:56:47,896 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:56:47,896 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:56:47,897 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:56:47,898 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:56:47,898 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:56:47,899 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:56:47,899 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:56:47,900 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:56:47,900 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:56:47,901 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:56:47,901 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:56:47,902 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:56:47,903 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:56:47,903 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:56:47,904 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:56:47,904 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:56:47,905 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:56:47,906 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 19:56:47,906 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:56:47,907 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:56:47,907 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:56:47,908 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:56:47,908 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 19:56:47,908 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:56:47,909 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 19:56:47,909 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:56:47,910 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 19:56:47,910 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:56:47,911 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:56:47,911 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:56:47,912 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:56:47,912 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:56:47,913 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:56:47,914 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:56:47,914 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 19:56:47,915 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:56:47,915 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:56:47,916 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:56:47,916 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 19:56:47,916 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:56:47,917 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:56:47,917 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_52f631be-2dc8-46c7-9c34-28f6cf4388e3/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a0e1e4b700be1f29c3e51242b4a74b80feb10d65ba6788a48a42ab27b5c7017d [2023-11-21 19:56:48,201 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:56:48,235 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:56:48,239 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:56:48,243 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:56:48,244 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:56:48,246 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/loops-crafted-1/mono-crafted_6.c [2023-11-21 19:56:51,351 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:56:51,607 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:56:51,608 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/sv-benchmarks/c/loops-crafted-1/mono-crafted_6.c [2023-11-21 19:56:51,614 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/data/be55b39b2/d838e82634a146bb937c65c4e5a8339f/FLAG02536ac7a [2023-11-21 19:56:51,629 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/data/be55b39b2/d838e82634a146bb937c65c4e5a8339f [2023-11-21 19:56:51,632 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:56:51,633 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:56:51,634 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:56:51,634 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:56:51,641 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:56:51,642 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:56:51" (1/1) ... [2023-11-21 19:56:51,643 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@46fe93aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:56:51, skipping insertion in model container [2023-11-21 19:56:51,643 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:56:51" (1/1) ... [2023-11-21 19:56:51,666 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:56:51,793 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_52f631be-2dc8-46c7-9c34-28f6cf4388e3/sv-benchmarks/c/loops-crafted-1/mono-crafted_6.c[318,331] [2023-11-21 19:56:51,805 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:56:51,813 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:56:51,823 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_52f631be-2dc8-46c7-9c34-28f6cf4388e3/sv-benchmarks/c/loops-crafted-1/mono-crafted_6.c[318,331] [2023-11-21 19:56:51,828 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:56:51,844 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:56:51,845 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:56:51 WrapperNode [2023-11-21 19:56:51,845 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:56:51,847 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:56:51,847 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:56:51,847 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:56:51,855 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:56:51" (1/1) ... [2023-11-21 19:56:51,864 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:56:51" (1/1) ... [2023-11-21 19:56:51,885 INFO L138 Inliner]: procedures = 12, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 37 [2023-11-21 19:56:51,886 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:56:51,886 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:56:51,886 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:56:51,887 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:56:51,895 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:56:51" (1/1) ... [2023-11-21 19:56:51,896 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:56:51" (1/1) ... [2023-11-21 19:56:51,897 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:56:51" (1/1) ... [2023-11-21 19:56:51,897 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:56:51" (1/1) ... [2023-11-21 19:56:51,900 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:56:51" (1/1) ... [2023-11-21 19:56:51,906 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:56:51" (1/1) ... [2023-11-21 19:56:51,914 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:56:51" (1/1) ... [2023-11-21 19:56:51,915 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:56:51" (1/1) ... [2023-11-21 19:56:51,917 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:56:51,919 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:56:51,919 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:56:51,920 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:56:51,920 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:56:51" (1/1) ... [2023-11-21 19:56:51,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:56:51,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:56:51,967 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:56:52,002 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:56:52,016 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:56:52,017 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:56:52,017 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:56:52,022 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:56:52,095 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:56:52,097 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:56:52,231 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:56:52,286 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:56:52,286 INFO L308 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-21 19:56:52,288 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:56:52 BoogieIcfgContainer [2023-11-21 19:56:52,288 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:56:52,290 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:56:52,291 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:56:52,294 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:56:52,294 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:56:51" (1/3) ... [2023-11-21 19:56:52,295 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e1c2787 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:56:52, skipping insertion in model container [2023-11-21 19:56:52,295 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:56:51" (2/3) ... [2023-11-21 19:56:52,295 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e1c2787 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:56:52, skipping insertion in model container [2023-11-21 19:56:52,296 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:56:52" (3/3) ... [2023-11-21 19:56:52,297 INFO L112 eAbstractionObserver]: Analyzing ICFG mono-crafted_6.c [2023-11-21 19:56:52,323 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:56:52,324 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-21 19:56:52,371 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:56:52,378 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;@60bcd6b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:56:52,378 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-21 19:56:52,383 INFO L276 IsEmpty]: Start isEmpty. Operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:56:52,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-21 19:56:52,389 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:56:52,389 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-21 19:56:52,390 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:56:52,395 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:56:52,395 INFO L85 PathProgramCache]: Analyzing trace with hash 2249734, now seen corresponding path program 1 times [2023-11-21 19:56:52,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:56:52,408 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1888808379] [2023-11-21 19:56:52,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:56:52,410 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:56:52,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:56:52,586 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 19:56:52,586 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:56:52,587 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1888808379] [2023-11-21 19:56:52,587 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1888808379] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:56:52,587 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:56:52,588 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 19:56:52,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836318086] [2023-11-21 19:56:52,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:56:52,594 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:56:52,595 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:56:52,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:56:52,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:56:52,626 INFO L87 Difference]: Start difference. First operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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 19:56:52,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:56:52,654 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2023-11-21 19:56:52,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:56:52,657 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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 4 [2023-11-21 19:56:52,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:56:52,665 INFO L225 Difference]: With dead ends: 13 [2023-11-21 19:56:52,665 INFO L226 Difference]: Without dead ends: 6 [2023-11-21 19:56:52,668 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 19:56:52,673 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:56:52,674 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:56:52,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2023-11-21 19:56:52,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2023-11-21 19:56:52,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 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 19:56:52,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2023-11-21 19:56:52,705 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2023-11-21 19:56:52,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:56:52,706 INFO L495 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2023-11-21 19:56:52,706 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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 19:56:52,707 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2023-11-21 19:56:52,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-21 19:56:52,707 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:56:52,707 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-21 19:56:52,708 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 19:56:52,708 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:56:52,709 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:56:52,709 INFO L85 PathProgramCache]: Analyzing trace with hash 69905095, now seen corresponding path program 1 times [2023-11-21 19:56:52,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:56:52,709 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2133336475] [2023-11-21 19:56:52,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:56:52,710 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:56:52,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:56:52,887 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 19:56:52,887 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:56:52,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2133336475] [2023-11-21 19:56:52,888 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2133336475] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:56:52,888 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [175809306] [2023-11-21 19:56:52,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:56:52,889 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:56:52,889 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:56:52,892 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:56:52,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:56:52,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:56:52,973 INFO L262 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-21 19:56:52,978 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:56:53,044 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 19:56:53,044 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:56:53,287 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 19:56:53,292 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [175809306] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:56:53,293 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [428427091] [2023-11-21 19:56:53,324 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-21 19:56:53,325 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:56:53,329 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:56:53,336 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:56:53,338 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:56:53,641 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:56:53,696 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '67#(and (<= 1 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= 1000000 |ULTIMATE.start_main_~x~0#1|)) (= |ULTIMATE.start_main_~z~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-21 19:56:53,696 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:56:53,696 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:56:53,697 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-21 19:56:53,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397733453] [2023-11-21 19:56:53,698 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:56:53,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 19:56:53,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:56:53,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 19:56:53,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2023-11-21 19:56:53,700 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:56:53,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:56:53,717 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2023-11-21 19:56:53,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:56:53,718 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-21 19:56:53,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:56:53,718 INFO L225 Difference]: With dead ends: 12 [2023-11-21 19:56:53,719 INFO L226 Difference]: Without dead ends: 9 [2023-11-21 19:56:53,719 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2023-11-21 19:56:53,721 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:56:53,721 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:56:53,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2023-11-21 19:56:53,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2023-11-21 19:56:53,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 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 19:56:53,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2023-11-21 19:56:53,725 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2023-11-21 19:56:53,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:56:53,725 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2023-11-21 19:56:53,725 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:56:53,726 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2023-11-21 19:56:53,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-21 19:56:53,726 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:56:53,726 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2023-11-21 19:56:53,751 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 19:56:53,946 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:56:53,946 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:56:53,947 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:56:53,947 INFO L85 PathProgramCache]: Analyzing trace with hash -354255802, now seen corresponding path program 2 times [2023-11-21 19:56:53,947 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:56:53,947 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126673202] [2023-11-21 19:56:53,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:56:53,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:56:53,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:56:54,285 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:56:54,287 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:56:54,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126673202] [2023-11-21 19:56:54,289 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1126673202] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:56:54,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2060561391] [2023-11-21 19:56:54,290 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:56:54,290 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:56:54,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:56:54,297 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:56:54,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:56:54,344 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-21 19:56:54,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:56:54,346 INFO L262 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-21 19:56:54,348 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:56:54,391 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:56:54,392 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:56:54,929 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:56:54,929 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2060561391] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:56:54,929 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1807100106] [2023-11-21 19:56:54,933 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-21 19:56:54,933 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:56:54,934 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:56:54,934 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:56:54,934 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:56:55,087 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:56:55,148 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '158#(and (<= 1 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= 1000000 |ULTIMATE.start_main_~x~0#1|)) (= |ULTIMATE.start_main_~z~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-21 19:56:55,148 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:56:55,149 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:56:55,149 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 14 [2023-11-21 19:56:55,149 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628535029] [2023-11-21 19:56:55,149 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:56:55,150 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-21 19:56:55,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:56:55,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-21 19:56:55,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=204, Unknown=0, NotChecked=0, Total=306 [2023-11-21 19:56:55,153 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:56:55,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:56:55,189 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2023-11-21 19:56:55,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-21 19:56:55,190 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-21 19:56:55,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:56:55,191 INFO L225 Difference]: With dead ends: 18 [2023-11-21 19:56:55,191 INFO L226 Difference]: Without dead ends: 15 [2023-11-21 19:56:55,192 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=102, Invalid=204, Unknown=0, NotChecked=0, Total=306 [2023-11-21 19:56:55,195 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:56:55,196 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:56:55,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-21 19:56:55,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-21 19:56:55,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:56:55,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2023-11-21 19:56:55,205 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 8 [2023-11-21 19:56:55,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:56:55,206 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2023-11-21 19:56:55,206 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:56:55,207 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2023-11-21 19:56:55,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-21 19:56:55,207 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:56:55,208 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1] [2023-11-21 19:56:55,233 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:56:55,421 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:56:55,422 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:56:55,422 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:56:55,422 INFO L85 PathProgramCache]: Analyzing trace with hash -904577882, now seen corresponding path program 3 times [2023-11-21 19:56:55,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:56:55,422 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367404755] [2023-11-21 19:56:55,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:56:55,423 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:56:55,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:56:55,999 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:56:55,999 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:56:55,999 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [367404755] [2023-11-21 19:56:56,000 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [367404755] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:56:56,000 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [307314963] [2023-11-21 19:56:56,000 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-21 19:56:56,000 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:56:56,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:56:56,001 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:56:56,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:56:56,060 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-21 19:56:56,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:56:56,062 INFO L262 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-21 19:56:56,066 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:56:56,127 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:56:56,127 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:56:56,945 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:56:56,945 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [307314963] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:56:56,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [479672274] [2023-11-21 19:56:56,949 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-21 19:56:56,949 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:56:56,949 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:56:56,950 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:56:56,950 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:56:57,043 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:56:57,116 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '321#(and (<= 1 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= 1000000 |ULTIMATE.start_main_~x~0#1|)) (= |ULTIMATE.start_main_~z~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-21 19:56:57,116 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:56:57,117 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:56:57,117 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 26 [2023-11-21 19:56:57,117 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692491391] [2023-11-21 19:56:57,117 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:56:57,118 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-21 19:56:57,118 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:56:57,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-21 19:56:57,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=336, Invalid=534, Unknown=0, NotChecked=0, Total=870 [2023-11-21 19:56:57,120 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 27 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 26 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) [2023-11-21 19:56:57,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:56:57,167 INFO L93 Difference]: Finished difference Result 30 states and 41 transitions. [2023-11-21 19:56:57,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-21 19:56:57,168 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 26 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 14 [2023-11-21 19:56:57,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:56:57,169 INFO L225 Difference]: With dead ends: 30 [2023-11-21 19:56:57,169 INFO L226 Difference]: Without dead ends: 27 [2023-11-21 19:56:57,170 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=336, Invalid=534, Unknown=0, NotChecked=0, Total=870 [2023-11-21 19:56:57,171 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:56:57,171 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 15 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:56:57,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-21 19:56:57,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-11-21 19:56:57,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:56:57,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2023-11-21 19:56:57,179 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 14 [2023-11-21 19:56:57,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:56:57,180 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2023-11-21 19:56:57,180 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 26 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) [2023-11-21 19:56:57,180 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2023-11-21 19:56:57,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-21 19:56:57,182 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:56:57,185 INFO L195 NwaCegarLoop]: trace histogram [22, 1, 1, 1, 1] [2023-11-21 19:56:57,211 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 19:56:57,405 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:56:57,406 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:56:57,406 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:56:57,406 INFO L85 PathProgramCache]: Analyzing trace with hash -658283162, now seen corresponding path program 4 times [2023-11-21 19:56:57,406 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:56:57,407 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1065587057] [2023-11-21 19:56:57,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:56:57,407 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:56:57,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:56:58,924 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:56:58,925 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:56:58,925 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1065587057] [2023-11-21 19:56:58,925 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1065587057] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:56:58,925 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [33735344] [2023-11-21 19:56:58,925 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-21 19:56:58,925 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:56:58,926 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:56:58,928 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:56:58,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 19:56:58,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:56:58,997 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-21 19:56:59,003 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:56:59,110 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:56:59,110 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:57:01,084 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:57:01,086 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [33735344] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:57:01,086 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [932366823] [2023-11-21 19:57:01,088 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-21 19:57:01,089 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:57:01,089 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:57:01,089 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:57:01,090 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:57:01,178 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:57:01,260 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '628#(and (<= 1 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= 1000000 |ULTIMATE.start_main_~x~0#1|)) (= |ULTIMATE.start_main_~z~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-21 19:57:01,260 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:57:01,260 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:57:01,260 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 50 [2023-11-21 19:57:01,261 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840703162] [2023-11-21 19:57:01,261 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:57:01,263 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-11-21 19:57:01,263 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:57:01,265 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-11-21 19:57:01,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1236, Invalid=1626, Unknown=0, NotChecked=0, Total=2862 [2023-11-21 19:57:01,269 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 51 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 50 states have internal predecessors, (55), 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 19:57:01,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:57:01,360 INFO L93 Difference]: Finished difference Result 54 states and 77 transitions. [2023-11-21 19:57:01,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-11-21 19:57:01,361 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 50 states have internal predecessors, (55), 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 26 [2023-11-21 19:57:01,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:57:01,362 INFO L225 Difference]: With dead ends: 54 [2023-11-21 19:57:01,363 INFO L226 Difference]: Without dead ends: 51 [2023-11-21 19:57:01,364 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1236, Invalid=1626, Unknown=0, NotChecked=0, Total=2862 [2023-11-21 19:57:01,365 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:57:01,366 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:57:01,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2023-11-21 19:57:01,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2023-11-21 19:57:01,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 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 19:57:01,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2023-11-21 19:57:01,380 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 26 [2023-11-21 19:57:01,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:57:01,381 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2023-11-21 19:57:01,381 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 50 states have internal predecessors, (55), 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 19:57:01,382 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2023-11-21 19:57:01,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-21 19:57:01,384 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:57:01,384 INFO L195 NwaCegarLoop]: trace histogram [46, 1, 1, 1, 1] [2023-11-21 19:57:01,410 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 19:57:01,597 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:57:01,597 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:57:01,598 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:57:01,598 INFO L85 PathProgramCache]: Analyzing trace with hash -1029024026, now seen corresponding path program 5 times [2023-11-21 19:57:01,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:57:01,598 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [265933683] [2023-11-21 19:57:01,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:57:01,599 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:57:01,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:57:06,209 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:57:06,210 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:57:06,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [265933683] [2023-11-21 19:57:06,210 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [265933683] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:57:06,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [767531596] [2023-11-21 19:57:06,210 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:57:06,210 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:57:06,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:57:06,211 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:57:06,233 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 19:57:06,368 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2023-11-21 19:57:06,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:57:06,371 INFO L262 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 48 conjunts are in the unsatisfiable core [2023-11-21 19:57:06,381 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:57:06,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:57:06,580 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:57:11,629 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:57:11,629 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [767531596] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:57:11,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1182341366] [2023-11-21 19:57:11,632 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-21 19:57:11,632 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:57:11,632 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:57:11,632 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:57:11,632 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:57:11,711 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:57:11,831 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1223#(and (<= 1 |#StackHeapBarrier|) (<= 1000000 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= 1000000 |ULTIMATE.start_main_~x~0#1|)) (= |ULTIMATE.start_main_~z~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-21 19:57:11,831 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:57:11,831 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:57:11,831 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 98 [2023-11-21 19:57:11,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292321480] [2023-11-21 19:57:11,832 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:57:11,832 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2023-11-21 19:57:11,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:57:11,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2023-11-21 19:57:11,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4764, Invalid=5538, Unknown=0, NotChecked=0, Total=10302 [2023-11-21 19:57:11,841 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 99 states, 99 states have (on average 1.0404040404040404) internal successors, (103), 98 states have internal predecessors, (103), 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 19:57:12,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:57:12,065 INFO L93 Difference]: Finished difference Result 102 states and 149 transitions. [2023-11-21 19:57:12,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2023-11-21 19:57:12,066 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 99 states have (on average 1.0404040404040404) internal successors, (103), 98 states have internal predecessors, (103), 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 [2023-11-21 19:57:12,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:57:12,073 INFO L225 Difference]: With dead ends: 102 [2023-11-21 19:57:12,074 INFO L226 Difference]: Without dead ends: 99 [2023-11-21 19:57:12,077 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 664 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=4764, Invalid=5538, Unknown=0, NotChecked=0, Total=10302 [2023-11-21 19:57:12,079 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:57:12,079 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 17 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:57:12,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-11-21 19:57:12,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2023-11-21 19:57:12,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.010204081632653) internal successors, (99), 98 states have internal predecessors, (99), 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 19:57:12,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2023-11-21 19:57:12,109 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 50 [2023-11-21 19:57:12,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:57:12,110 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2023-11-21 19:57:12,110 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 99 states have (on average 1.0404040404040404) internal successors, (103), 98 states have internal predecessors, (103), 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 19:57:12,110 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2023-11-21 19:57:12,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2023-11-21 19:57:12,115 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:57:12,115 INFO L195 NwaCegarLoop]: trace histogram [94, 1, 1, 1, 1] [2023-11-21 19:57:12,142 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-21 19:57:12,336 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-21 19:57:12,337 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:57:12,337 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:57:12,337 INFO L85 PathProgramCache]: Analyzing trace with hash -1918490, now seen corresponding path program 6 times [2023-11-21 19:57:12,337 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:57:12,337 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913160820] [2023-11-21 19:57:12,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:57:12,338 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:57:12,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:57:25,918 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:57:25,918 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:57:25,919 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913160820] [2023-11-21 19:57:25,919 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1913160820] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:57:25,919 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367970578] [2023-11-21 19:57:25,919 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-21 19:57:25,919 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:57:25,920 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:57:25,921 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:57:25,922 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_52f631be-2dc8-46c7-9c34-28f6cf4388e3/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-21 19:57:26,063 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-21 19:57:26,063 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:57:26,067 INFO L262 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 96 conjunts are in the unsatisfiable core [2023-11-21 19:57:26,083 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:57:26,461 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:57:26,461 INFO L327 TraceCheckSpWp]: Computing backward predicates...