./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-lopstr16/single_elem_safe.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc 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_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-lopstr16/single_elem_safe.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh --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 f1aed9bc44add9424c35127ba8c0166402387241540742ea765fb4b7385c8271 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 13:54:13,192 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 13:54:13,266 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 13:54:13,271 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 13:54:13,272 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 13:54:13,303 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 13:54:13,304 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 13:54:13,305 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 13:54:13,305 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 13:54:13,306 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 13:54:13,307 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 13:54:13,307 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 13:54:13,308 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 13:54:13,308 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 13:54:13,309 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 13:54:13,309 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 13:54:13,310 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 13:54:13,311 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 13:54:13,311 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 13:54:13,312 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 13:54:13,312 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 13:54:13,313 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 13:54:13,314 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 13:54:13,315 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 13:54:13,315 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 13:54:13,316 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 13:54:13,316 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 13:54:13,317 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 13:54:13,317 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 13:54:13,317 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 13:54:13,318 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 13:54:13,318 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 13:54:13,319 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 13:54:13,319 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 13:54:13,320 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 13:54:13,320 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 13:54:13,320 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 13:54:13,320 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 13:54:13,321 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 13:54:13,321 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 13:54:13,321 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 13:54:13,321 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 13:54:13,322 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 13:54:13,322 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 13:54:13,322 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 13:54:13,322 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 13:54:13,322 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 13:54:13,323 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_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f1aed9bc44add9424c35127ba8c0166402387241540742ea765fb4b7385c8271 [2023-12-02 13:54:13,572 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 13:54:13,596 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 13:54:13,599 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 13:54:13,600 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 13:54:13,601 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 13:54:13,602 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-lopstr16/single_elem_safe.i [2023-12-02 13:54:16,659 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 13:54:16,856 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 13:54:16,856 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/sv-benchmarks/c/array-lopstr16/single_elem_safe.i [2023-12-02 13:54:16,864 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/data/2f35463de/96e301c84896480d88952ae92149ce54/FLAG7341b121a [2023-12-02 13:54:16,878 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/data/2f35463de/96e301c84896480d88952ae92149ce54 [2023-12-02 13:54:16,881 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 13:54:16,883 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 13:54:16,885 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 13:54:16,885 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 13:54:16,891 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 13:54:16,892 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 01:54:16" (1/1) ... [2023-12-02 13:54:16,893 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@512f547c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:54:16, skipping insertion in model container [2023-12-02 13:54:16,894 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 01:54:16" (1/1) ... [2023-12-02 13:54:16,918 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 13:54:17,076 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_0d7eb772-de41-41ec-a513-fa221520549f/sv-benchmarks/c/array-lopstr16/single_elem_safe.i[809,822] [2023-12-02 13:54:17,102 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 13:54:17,116 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 13:54:17,132 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_0d7eb772-de41-41ec-a513-fa221520549f/sv-benchmarks/c/array-lopstr16/single_elem_safe.i[809,822] [2023-12-02 13:54:17,141 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 13:54:17,159 INFO L206 MainTranslator]: Completed translation [2023-12-02 13:54:17,159 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:54:17 WrapperNode [2023-12-02 13:54:17,160 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 13:54:17,161 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 13:54:17,161 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 13:54:17,161 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 13:54:17,168 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:54:17" (1/1) ... [2023-12-02 13:54:17,178 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:54:17" (1/1) ... [2023-12-02 13:54:17,204 INFO L138 Inliner]: procedures = 19, calls = 20, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 75 [2023-12-02 13:54:17,205 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 13:54:17,206 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 13:54:17,206 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 13:54:17,206 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 13:54:17,216 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:54:17" (1/1) ... [2023-12-02 13:54:17,216 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:54:17" (1/1) ... [2023-12-02 13:54:17,219 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:54:17" (1/1) ... [2023-12-02 13:54:17,219 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:54:17" (1/1) ... [2023-12-02 13:54:17,226 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:54:17" (1/1) ... [2023-12-02 13:54:17,231 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:54:17" (1/1) ... [2023-12-02 13:54:17,233 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:54:17" (1/1) ... [2023-12-02 13:54:17,234 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:54:17" (1/1) ... [2023-12-02 13:54:17,237 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 13:54:17,239 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 13:54:17,239 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 13:54:17,239 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 13:54:17,240 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:54:17" (1/1) ... [2023-12-02 13:54:17,248 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 13:54:17,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:54:17,276 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 13:54:17,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 13:54:17,318 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-12-02 13:54:17,319 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 13:54:17,319 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 13:54:17,319 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-12-02 13:54:17,319 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 13:54:17,319 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-12-02 13:54:17,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 13:54:17,320 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 13:54:17,320 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 13:54:17,406 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 13:54:17,408 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 13:54:17,576 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 13:54:17,682 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 13:54:17,682 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-12-02 13:54:17,684 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 01:54:17 BoogieIcfgContainer [2023-12-02 13:54:17,684 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 13:54:17,688 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 13:54:17,688 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 13:54:17,692 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 13:54:17,693 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 01:54:16" (1/3) ... [2023-12-02 13:54:17,694 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67a76478 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 01:54:17, skipping insertion in model container [2023-12-02 13:54:17,694 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:54:17" (2/3) ... [2023-12-02 13:54:17,694 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67a76478 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 01:54:17, skipping insertion in model container [2023-12-02 13:54:17,694 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 01:54:17" (3/3) ... [2023-12-02 13:54:17,696 INFO L112 eAbstractionObserver]: Analyzing ICFG single_elem_safe.i [2023-12-02 13:54:17,720 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 13:54:17,720 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 13:54:17,780 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 13:54:17,789 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;@2a4e7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 13:54:17,789 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 13:54:17,794 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:54:17,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 13:54:17,802 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:54:17,803 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-12-02 13:54:17,803 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:54:17,810 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:54:17,810 INFO L85 PathProgramCache]: Analyzing trace with hash -1181219824, now seen corresponding path program 1 times [2023-12-02 13:54:17,823 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:54:17,823 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989055010] [2023-12-02 13:54:17,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:54:17,824 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:54:17,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:54:18,097 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:54:18,098 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:54:18,098 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989055010] [2023-12-02 13:54:18,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1989055010] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:54:18,100 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:54:18,100 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 13:54:18,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513682700] [2023-12-02 13:54:18,103 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:54:18,108 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:54:18,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:54:18,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:54:18,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 13:54:18,146 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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) [2023-12-02 13:54:18,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:54:18,217 INFO L93 Difference]: Finished difference Result 26 states and 35 transitions. [2023-12-02 13:54:18,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:54:18,231 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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) Word has length 6 [2023-12-02 13:54:18,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:54:18,238 INFO L225 Difference]: With dead ends: 26 [2023-12-02 13:54:18,238 INFO L226 Difference]: Without dead ends: 17 [2023-12-02 13:54:18,241 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 [2023-12-02 13:54:18,245 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 7 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 13:54:18,247 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 12 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 13:54:18,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-12-02 13:54:18,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 10. [2023-12-02 13:54:18,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:54:18,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2023-12-02 13:54:18,275 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 6 [2023-12-02 13:54:18,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:54:18,276 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2023-12-02 13:54:18,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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) [2023-12-02 13:54:18,277 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2023-12-02 13:54:18,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 13:54:18,277 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:54:18,278 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:54:18,278 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 13:54:18,278 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:54:18,279 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:54:18,279 INFO L85 PathProgramCache]: Analyzing trace with hash -2053176566, now seen corresponding path program 1 times [2023-12-02 13:54:18,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:54:18,279 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2098989399] [2023-12-02 13:54:18,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:54:18,280 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:54:18,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:54:18,455 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:54:18,455 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:54:18,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2098989399] [2023-12-02 13:54:18,455 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2098989399] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:54:18,456 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1882033318] [2023-12-02 13:54:18,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:54:18,456 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:54:18,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:54:18,461 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:54:18,464 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 13:54:18,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:54:18,583 INFO L262 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 13:54:18,588 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:54:18,625 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:54:18,625 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:54:18,649 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:54:18,649 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1882033318] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:54:18,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [325833120] [2023-12-02 13:54:18,673 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 13:54:18,674 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:54:18,677 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:54:18,684 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:54:18,685 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:54:21,471 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:54:22,016 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '103#(and (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~s1~0#1.base|) |ULTIMATE.start_main_~s1~0#1.offset|) 0) (exists ((|v_#memory_$Pointer$.base_60| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_60| |~#a~0.base| (store (select |v_#memory_$Pointer$.base_60| |~#a~0.base|) (+ 12 |~#a~0.offset|) (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)))))) (= |ULTIMATE.start_main_~i~0#1| 0) (exists ((|v_#memory_int_56| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_56| |~#a~0.base| (store (select |v_#memory_int_56| |~#a~0.base|) (+ 12 |~#a~0.offset|) (select (select |#memory_int| |~#a~0.base|) (+ 12 |~#a~0.offset|)))))) (exists ((|v_#length_40| (Array Int Int))) (= |#length| (store |v_#length_40| (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)) 8))) (or (not (= |ULTIMATE.start_main_~s1~0#1.offset| 0)) (not (= |ULTIMATE.start_main_~s1~0#1.base| 0))) (= |ULTIMATE.start_main_#t~mem11#1.offset| 0) (= |ULTIMATE.start_main_~s1~0#1.offset| (select (select |#memory_$Pointer$.offset| |~#a~0.base|) |~#a~0.offset|)) (= |ULTIMATE.start_main_#t~mem11#1.base| 0) (exists ((|v_#valid_40| (Array Int Int))) (and (= (select |v_#valid_40| (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|))) 0) (= (store |v_#valid_40| (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)) 1) |#valid|))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~s1~0#1.base|) |ULTIMATE.start_main_~s1~0#1.offset|) 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~s1~0#1.base|) (+ |ULTIMATE.start_main_~s1~0#1.offset| 4)) 0) (not (= (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)) 0)) (<= (+ (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)) 1) |#StackHeapBarrier|) (= |ULTIMATE.start_main_~s1~0#1.base| (select (select |#memory_$Pointer$.base| |~#a~0.base|) |~#a~0.offset|)) (exists ((|v_#memory_$Pointer$.offset_60| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_60| |~#a~0.base| (store (select |v_#memory_$Pointer$.offset_60| |~#a~0.base|) (+ 12 |~#a~0.offset|) 0)))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 13:54:22,016 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:54:22,016 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:54:22,016 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-12-02 13:54:22,017 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742601750] [2023-12-02 13:54:22,018 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:54:22,018 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 13:54:22,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:54:22,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 13:54:22,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=57, Unknown=0, NotChecked=0, Total=110 [2023-12-02 13:54:22,020 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:54:22,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:54:22,106 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2023-12-02 13:54:22,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 13:54:22,106 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 13:54:22,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:54:22,107 INFO L225 Difference]: With dead ends: 42 [2023-12-02 13:54:22,108 INFO L226 Difference]: Without dead ends: 35 [2023-12-02 13:54:22,108 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=57, Unknown=0, NotChecked=0, Total=110 [2023-12-02 13:54:22,110 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 42 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:54:22,111 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 24 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:54:22,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-12-02 13:54:22,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 13. [2023-12-02 13:54:22,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 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) [2023-12-02 13:54:22,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2023-12-02 13:54:22,117 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 7 [2023-12-02 13:54:22,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:54:22,117 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2023-12-02 13:54:22,118 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:54:22,118 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2023-12-02 13:54:22,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-12-02 13:54:22,119 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:54:22,119 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1] [2023-12-02 13:54:22,127 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 13:54:22,324 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:54:22,325 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:54:22,325 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:54:22,326 INFO L85 PathProgramCache]: Analyzing trace with hash 48034448, now seen corresponding path program 2 times [2023-12-02 13:54:22,326 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:54:22,326 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351548199] [2023-12-02 13:54:22,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:54:22,327 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:54:22,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:54:22,651 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:54:22,651 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:54:22,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351548199] [2023-12-02 13:54:22,652 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351548199] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:54:22,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463993943] [2023-12-02 13:54:22,652 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 13:54:22,653 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:54:22,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:54:22,654 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:54:22,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 13:54:23,464 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 13:54:23,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 13:54:23,467 INFO L262 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 13:54:23,468 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:54:23,484 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:54:23,484 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:54:23,561 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:54:23,561 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463993943] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:54:23,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [705475244] [2023-12-02 13:54:23,565 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 13:54:23,565 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:54:23,565 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:54:23,566 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:54:23,566 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:54:26,181 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:54:26,643 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '246#(and (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~s1~0#1.base|) |ULTIMATE.start_main_~s1~0#1.offset|) 0) (exists ((|v_#memory_$Pointer$.base_85| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_85| |~#a~0.base| (store (select |v_#memory_$Pointer$.base_85| |~#a~0.base|) (+ 12 |~#a~0.offset|) (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)))) |#memory_$Pointer$.base|)) (= |ULTIMATE.start_main_~i~0#1| 0) (exists ((|v_#valid_56| (Array Int Int))) (and (= |#valid| (store |v_#valid_56| (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)) 1)) (= (select |v_#valid_56| (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|))) 0))) (or (not (= |ULTIMATE.start_main_~s1~0#1.offset| 0)) (not (= |ULTIMATE.start_main_~s1~0#1.base| 0))) (= |ULTIMATE.start_main_#t~mem11#1.offset| 0) (exists ((|v_#memory_$Pointer$.offset_85| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_85| |~#a~0.base| (store (select |v_#memory_$Pointer$.offset_85| |~#a~0.base|) (+ 12 |~#a~0.offset|) 0)))) (= |ULTIMATE.start_main_~s1~0#1.offset| (select (select |#memory_$Pointer$.offset| |~#a~0.base|) |~#a~0.offset|)) (= |ULTIMATE.start_main_#t~mem11#1.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~s1~0#1.base|) |ULTIMATE.start_main_~s1~0#1.offset|) 0) (exists ((|v_#memory_int_80| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_80| |~#a~0.base| (store (select |v_#memory_int_80| |~#a~0.base|) (+ 12 |~#a~0.offset|) (select (select |#memory_int| |~#a~0.base|) (+ 12 |~#a~0.offset|)))))) (= (select (select |#memory_int| |ULTIMATE.start_main_~s1~0#1.base|) (+ |ULTIMATE.start_main_~s1~0#1.offset| 4)) 0) (not (= (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)) 0)) (<= (+ (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)) 1) |#StackHeapBarrier|) (= |ULTIMATE.start_main_~s1~0#1.base| (select (select |#memory_$Pointer$.base| |~#a~0.base|) |~#a~0.offset|)) (exists ((|v_#length_56| (Array Int Int))) (= |#length| (store |v_#length_56| (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)) 8))) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 13:54:26,643 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:54:26,643 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:54:26,643 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-12-02 13:54:26,644 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064541797] [2023-12-02 13:54:26,644 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:54:26,644 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 13:54:26,644 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:54:26,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 13:54:26,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=138, Unknown=0, NotChecked=0, Total=272 [2023-12-02 13:54:26,646 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 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) [2023-12-02 13:54:26,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:54:26,907 INFO L93 Difference]: Finished difference Result 90 states and 108 transitions. [2023-12-02 13:54:26,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 13:54:26,907 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 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 [2023-12-02 13:54:26,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:54:26,909 INFO L225 Difference]: With dead ends: 90 [2023-12-02 13:54:26,909 INFO L226 Difference]: Without dead ends: 83 [2023-12-02 13:54:26,910 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=134, Invalid=138, Unknown=0, NotChecked=0, Total=272 [2023-12-02 13:54:26,911 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 105 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 13:54:26,912 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 60 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 13:54:26,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2023-12-02 13:54:26,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 19. [2023-12-02 13:54:26,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:54:26,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2023-12-02 13:54:26,920 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 10 [2023-12-02 13:54:26,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:54:26,921 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2023-12-02 13:54:26,921 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 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) [2023-12-02 13:54:26,921 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2023-12-02 13:54:26,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-12-02 13:54:26,922 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:54:26,922 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1] [2023-12-02 13:54:26,929 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 13:54:27,122 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:54:27,123 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:54:27,123 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:54:27,123 INFO L85 PathProgramCache]: Analyzing trace with hash 179519568, now seen corresponding path program 3 times [2023-12-02 13:54:27,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:54:27,124 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584833360] [2023-12-02 13:54:27,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:54:27,124 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:54:27,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:54:27,938 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:54:27,938 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:54:27,939 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584833360] [2023-12-02 13:54:27,939 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584833360] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:54:27,939 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [847805324] [2023-12-02 13:54:27,939 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 13:54:27,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:54:27,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:54:27,941 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:54:27,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 13:54:28,285 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 13:54:28,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 13:54:28,289 INFO L262 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 13:54:28,293 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:54:28,332 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:54:28,332 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:54:28,550 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:54:28,550 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [847805324] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:54:28,550 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1778640420] [2023-12-02 13:54:28,553 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 13:54:28,553 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:54:28,554 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:54:28,554 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:54:28,554 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:54:30,308 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:54:30,672 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '509#(and (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~s1~0#1.base|) |ULTIMATE.start_main_~s1~0#1.offset|) 0) (exists ((|v_#memory_int_134| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_134| |~#a~0.base| (store (select |v_#memory_int_134| |~#a~0.base|) (+ 12 |~#a~0.offset|) (select (select |#memory_int| |~#a~0.base|) (+ 12 |~#a~0.offset|)))))) (exists ((|v_#length_90| (Array Int Int))) (= |#length| (store |v_#length_90| (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)) 8))) (= |ULTIMATE.start_main_~i~0#1| 0) (or (not (= |ULTIMATE.start_main_~s1~0#1.offset| 0)) (not (= |ULTIMATE.start_main_~s1~0#1.base| 0))) (= |ULTIMATE.start_main_#t~mem11#1.offset| 0) (= |ULTIMATE.start_main_~s1~0#1.offset| (select (select |#memory_$Pointer$.offset| |~#a~0.base|) |~#a~0.offset|)) (= |ULTIMATE.start_main_#t~mem11#1.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~s1~0#1.base|) |ULTIMATE.start_main_~s1~0#1.offset|) 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~s1~0#1.base|) (+ |ULTIMATE.start_main_~s1~0#1.offset| 4)) 0) (not (= (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)) 0)) (<= (+ (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)) 1) |#StackHeapBarrier|) (= |ULTIMATE.start_main_~s1~0#1.base| (select (select |#memory_$Pointer$.base| |~#a~0.base|) |~#a~0.offset|)) (exists ((|v_#memory_$Pointer$.base_140| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_140| |~#a~0.base| (store (select |v_#memory_$Pointer$.base_140| |~#a~0.base|) (+ 12 |~#a~0.offset|) (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)))) |#memory_$Pointer$.base|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (exists ((|v_#memory_$Pointer$.offset_140| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_140| |~#a~0.base| (store (select |v_#memory_$Pointer$.offset_140| |~#a~0.base|) (+ 12 |~#a~0.offset|) 0)))) (exists ((|v_#valid_90| (Array Int Int))) (and (= |#valid| (store |v_#valid_90| (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)) 1)) (= (select |v_#valid_90| (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|))) 0))))' at error location [2023-12-02 13:54:30,673 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:54:30,673 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:54:30,673 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2023-12-02 13:54:30,673 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676244957] [2023-12-02 13:54:30,673 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:54:30,674 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-12-02 13:54:30,674 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:54:30,675 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-12-02 13:54:30,675 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=408, Unknown=0, NotChecked=0, Total=812 [2023-12-02 13:54:30,675 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 25 states, 25 states have (on average 1.2) internal successors, (30), 24 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) [2023-12-02 13:54:31,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:54:31,209 INFO L93 Difference]: Finished difference Result 186 states and 222 transitions. [2023-12-02 13:54:31,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-12-02 13:54:31,209 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.2) internal successors, (30), 24 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 [2023-12-02 13:54:31,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:54:31,212 INFO L225 Difference]: With dead ends: 186 [2023-12-02 13:54:31,212 INFO L226 Difference]: Without dead ends: 179 [2023-12-02 13:54:31,213 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=404, Invalid=408, Unknown=0, NotChecked=0, Total=812 [2023-12-02 13:54:31,214 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 322 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 322 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 13:54:31,215 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [322 Valid, 132 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 13:54:31,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2023-12-02 13:54:31,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 31. [2023-12-02 13:54:31,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:54:31,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2023-12-02 13:54:31,227 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 16 [2023-12-02 13:54:31,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:54:31,227 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2023-12-02 13:54:31,228 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.2) internal successors, (30), 24 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) [2023-12-02 13:54:31,228 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2023-12-02 13:54:31,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-12-02 13:54:31,229 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:54:31,229 INFO L195 NwaCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1] [2023-12-02 13:54:31,236 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 13:54:31,432 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:54:31,433 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:54:31,433 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:54:31,434 INFO L85 PathProgramCache]: Analyzing trace with hash -2003309616, now seen corresponding path program 4 times [2023-12-02 13:54:31,434 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:54:31,434 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1790434265] [2023-12-02 13:54:31,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:54:31,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:54:31,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:54:33,509 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:54:33,510 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:54:33,510 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1790434265] [2023-12-02 13:54:33,510 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1790434265] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:54:33,510 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1290103394] [2023-12-02 13:54:33,510 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 13:54:33,510 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:54:33,511 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:54:33,511 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:54:33,512 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 13:54:34,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:54:34,098 INFO L262 TraceCheckSpWp]: Trace formula consists of 1131 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 13:54:34,102 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:54:34,151 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:54:34,151 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:54:34,881 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:54:34,881 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1290103394] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:54:34,881 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [977028940] [2023-12-02 13:54:34,884 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 13:54:34,884 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:54:34,884 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:54:34,884 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:54:34,884 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:54:37,281 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:54:37,657 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1012#(and (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~s1~0#1.base|) |ULTIMATE.start_main_~s1~0#1.offset|) 0) (exists ((|v_#memory_$Pointer$.base_255| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_255| |~#a~0.base| (store (select |v_#memory_$Pointer$.base_255| |~#a~0.base|) (+ 12 |~#a~0.offset|) (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)))) |#memory_$Pointer$.base|)) (= |ULTIMATE.start_main_~i~0#1| 0) (exists ((|v_#length_160| (Array Int Int))) (= (store |v_#length_160| (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)) 8) |#length|)) (or (not (= |ULTIMATE.start_main_~s1~0#1.offset| 0)) (not (= |ULTIMATE.start_main_~s1~0#1.base| 0))) (= |ULTIMATE.start_main_#t~mem11#1.offset| 0) (= |ULTIMATE.start_main_~s1~0#1.offset| (select (select |#memory_$Pointer$.offset| |~#a~0.base|) |~#a~0.offset|)) (exists ((|v_#memory_$Pointer$.offset_255| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_255| |~#a~0.base| (store (select |v_#memory_$Pointer$.offset_255| |~#a~0.base|) (+ 12 |~#a~0.offset|) 0)))) (= |ULTIMATE.start_main_#t~mem11#1.base| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~s1~0#1.base|) |ULTIMATE.start_main_~s1~0#1.offset|) 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~s1~0#1.base|) (+ |ULTIMATE.start_main_~s1~0#1.offset| 4)) 0) (not (= (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)) 0)) (<= (+ (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)) 1) |#StackHeapBarrier|) (= |ULTIMATE.start_main_~s1~0#1.base| (select (select |#memory_$Pointer$.base| |~#a~0.base|) |~#a~0.offset|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (exists ((|v_#valid_160| (Array Int Int))) (and (= (select |v_#valid_160| (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|))) 0) (= (store |v_#valid_160| (select (select |#memory_$Pointer$.base| |~#a~0.base|) (+ 12 |~#a~0.offset|)) 1) |#valid|))) (exists ((|v_#memory_int_248| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_248| |~#a~0.base| (store (select |v_#memory_int_248| |~#a~0.base|) (+ 12 |~#a~0.offset|) (select (select |#memory_int| |~#a~0.base|) (+ 12 |~#a~0.offset|)))))))' at error location [2023-12-02 13:54:37,657 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:54:37,657 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:54:37,657 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2023-12-02 13:54:37,658 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962511674] [2023-12-02 13:54:37,658 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:54:37,659 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-12-02 13:54:37,659 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:54:37,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-12-02 13:54:37,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=1380, Unknown=0, NotChecked=0, Total=2756 [2023-12-02 13:54:37,663 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 49 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 48 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) [2023-12-02 13:54:38,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:54:38,419 INFO L93 Difference]: Finished difference Result 378 states and 450 transitions. [2023-12-02 13:54:38,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-12-02 13:54:38,419 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 48 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 [2023-12-02 13:54:38,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:54:38,423 INFO L225 Difference]: With dead ends: 378 [2023-12-02 13:54:38,423 INFO L226 Difference]: Without dead ends: 371 [2023-12-02 13:54:38,425 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1376, Invalid=1380, Unknown=0, NotChecked=0, Total=2756 [2023-12-02 13:54:38,426 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 1190 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1190 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 172 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 13:54:38,427 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1190 Valid, 282 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [172 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 13:54:38,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2023-12-02 13:54:38,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 55. [2023-12-02 13:54:38,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 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) [2023-12-02 13:54:38,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2023-12-02 13:54:38,445 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 28 [2023-12-02 13:54:38,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:54:38,446 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2023-12-02 13:54:38,446 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 48 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) [2023-12-02 13:54:38,446 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2023-12-02 13:54:38,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2023-12-02 13:54:38,448 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:54:38,448 INFO L195 NwaCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1] [2023-12-02 13:54:38,458 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 13:54:38,649 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:54:38,649 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:54:38,650 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:54:38,650 INFO L85 PathProgramCache]: Analyzing trace with hash -2066644272, now seen corresponding path program 5 times [2023-12-02 13:54:38,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:54:38,650 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396444817] [2023-12-02 13:54:38,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:54:38,650 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:54:38,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:54:43,872 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:54:43,872 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:54:43,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396444817] [2023-12-02 13:54:43,873 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [396444817] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:54:43,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1679952230] [2023-12-02 13:54:43,873 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 13:54:43,873 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:54:43,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:54:43,874 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:54:43,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0d7eb772-de41-41ec-a513-fa221520549f/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process