./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-multidimensional/rev-3-u.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/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_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-multidimensional/rev-3-u.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/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_a0c68007-27d5-45ab-8fcc-1bde2b89c764/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 fe3cf414f0e241a9a4e73e59647cf6619ea50b905df4a1c2a404b3413992b780 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 13:53:00,618 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 13:53:00,682 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 13:53:00,686 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 13:53:00,687 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 13:53:00,709 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 13:53:00,710 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 13:53:00,710 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 13:53:00,711 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 13:53:00,712 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 13:53:00,712 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 13:53:00,713 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 13:53:00,713 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 13:53:00,714 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 13:53:00,714 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 13:53:00,715 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 13:53:00,715 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 13:53:00,716 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 13:53:00,716 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 13:53:00,717 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 13:53:00,717 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 13:53:00,720 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 13:53:00,721 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 13:53:00,722 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 13:53:00,722 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 13:53:00,723 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 13:53:00,723 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 13:53:00,723 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 13:53:00,724 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 13:53:00,724 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 13:53:00,724 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 13:53:00,725 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 13:53:00,725 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 13:53:00,725 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 13:53:00,725 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 13:53:00,726 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 13:53:00,726 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 13:53:00,726 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 13:53:00,726 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 13:53:00,726 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 13:53:00,727 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 13:53:00,727 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 13:53:00,727 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 13:53:00,727 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 13:53:00,728 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 13:53:00,728 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 13:53:00,728 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 13:53:00,728 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_a0c68007-27d5-45ab-8fcc-1bde2b89c764/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fe3cf414f0e241a9a4e73e59647cf6619ea50b905df4a1c2a404b3413992b780 [2023-12-02 13:53:00,960 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 13:53:00,982 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 13:53:00,984 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 13:53:00,986 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 13:53:00,986 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 13:53:00,987 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-multidimensional/rev-3-u.c [2023-12-02 13:53:03,721 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 13:53:03,896 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 13:53:03,897 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/sv-benchmarks/c/array-multidimensional/rev-3-u.c [2023-12-02 13:53:03,902 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/data/d341dce43/0bf387adc9054d85b70101cc45fb28e0/FLAGf6547dc63 [2023-12-02 13:53:03,912 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/data/d341dce43/0bf387adc9054d85b70101cc45fb28e0 [2023-12-02 13:53:03,914 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 13:53:03,915 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 13:53:03,916 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 13:53:03,917 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 13:53:03,922 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 13:53:03,922 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 01:53:03" (1/1) ... [2023-12-02 13:53:03,923 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@26a7e323 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:53:03, skipping insertion in model container [2023-12-02 13:53:03,923 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 01:53:03" (1/1) ... [2023-12-02 13:53:03,942 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 13:53:04,057 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_a0c68007-27d5-45ab-8fcc-1bde2b89c764/sv-benchmarks/c/array-multidimensional/rev-3-u.c[319,332] [2023-12-02 13:53:04,079 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 13:53:04,089 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 13:53:04,097 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_a0c68007-27d5-45ab-8fcc-1bde2b89c764/sv-benchmarks/c/array-multidimensional/rev-3-u.c[319,332] [2023-12-02 13:53:04,109 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 13:53:04,122 INFO L206 MainTranslator]: Completed translation [2023-12-02 13:53:04,122 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:53:04 WrapperNode [2023-12-02 13:53:04,122 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 13:53:04,123 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 13:53:04,123 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 13:53:04,124 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 13:53:04,129 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:53:04" (1/1) ... [2023-12-02 13:53:04,136 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:53:04" (1/1) ... [2023-12-02 13:53:04,155 INFO L138 Inliner]: procedures = 14, calls = 19, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 106 [2023-12-02 13:53:04,155 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 13:53:04,156 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 13:53:04,156 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 13:53:04,156 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 13:53:04,164 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:53:04" (1/1) ... [2023-12-02 13:53:04,164 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:53:04" (1/1) ... [2023-12-02 13:53:04,166 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:53:04" (1/1) ... [2023-12-02 13:53:04,167 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:53:04" (1/1) ... [2023-12-02 13:53:04,171 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:53:04" (1/1) ... [2023-12-02 13:53:04,175 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:53:04" (1/1) ... [2023-12-02 13:53:04,176 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:53:04" (1/1) ... [2023-12-02 13:53:04,177 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:53:04" (1/1) ... [2023-12-02 13:53:04,179 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 13:53:04,180 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 13:53:04,180 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 13:53:04,180 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 13:53:04,181 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:53:04" (1/1) ... [2023-12-02 13:53:04,185 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 13:53:04,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:53:04,205 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 13:53:04,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 13:53:04,233 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 13:53:04,233 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 13:53:04,233 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 13:53:04,233 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 13:53:04,233 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 13:53:04,233 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 13:53:04,233 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 13:53:04,233 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 13:53:04,291 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 13:53:04,293 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 13:53:04,443 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 13:53:04,499 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 13:53:04,499 INFO L309 CfgBuilder]: Removed 9 assume(true) statements. [2023-12-02 13:53:04,501 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 01:53:04 BoogieIcfgContainer [2023-12-02 13:53:04,501 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 13:53:04,504 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 13:53:04,504 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 13:53:04,507 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 13:53:04,507 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 01:53:03" (1/3) ... [2023-12-02 13:53:04,508 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1064880c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 01:53:04, skipping insertion in model container [2023-12-02 13:53:04,508 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:53:04" (2/3) ... [2023-12-02 13:53:04,508 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1064880c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 01:53:04, skipping insertion in model container [2023-12-02 13:53:04,508 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 01:53:04" (3/3) ... [2023-12-02 13:53:04,510 INFO L112 eAbstractionObserver]: Analyzing ICFG rev-3-u.c [2023-12-02 13:53:04,524 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 13:53:04,524 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 13:53:04,562 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 13:53:04,567 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;@3f729447, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 13:53:04,567 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 13:53:04,571 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:53:04,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 13:53:04,576 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:53:04,577 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:53:04,577 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:53:04,581 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:53:04,581 INFO L85 PathProgramCache]: Analyzing trace with hash -369081953, now seen corresponding path program 1 times [2023-12-02 13:53:04,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:53:04,589 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016173091] [2023-12-02 13:53:04,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:53:04,589 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:53:04,674 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 13:53:04,675 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1140979859] [2023-12-02 13:53:04,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:53:04,676 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:53:04,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:53:04,680 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:53:04,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 13:53:04,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:53:04,759 INFO L262 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 13:53:04,763 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:53:04,822 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 13:53:04,822 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:53:04,822 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:53:04,823 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016173091] [2023-12-02 13:53:04,823 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 13:53:04,823 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1140979859] [2023-12-02 13:53:04,824 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1140979859] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:53:04,824 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:53:04,824 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 13:53:04,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083969019] [2023-12-02 13:53:04,827 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:53:04,832 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:53:04,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:53:04,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:53:04,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 13:53:04,863 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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) [2023-12-02 13:53:04,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:53:04,926 INFO L93 Difference]: Finished difference Result 29 states and 47 transitions. [2023-12-02 13:53:04,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:53:04,928 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-12-02 13:53:04,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:53:04,936 INFO L225 Difference]: With dead ends: 29 [2023-12-02 13:53:04,936 INFO L226 Difference]: Without dead ends: 17 [2023-12-02 13:53:04,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 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 13:53:04,942 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 4 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 13:53:04,943 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 14 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 13:53:04,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-12-02 13:53:04,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 15. [2023-12-02 13:53:04,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:53:04,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 23 transitions. [2023-12-02 13:53:04,975 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 23 transitions. Word has length 8 [2023-12-02 13:53:04,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:53:04,976 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 23 transitions. [2023-12-02 13:53:04,976 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 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) [2023-12-02 13:53:04,976 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 23 transitions. [2023-12-02 13:53:04,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-12-02 13:53:04,977 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:53:04,977 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:53:04,984 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 13:53:05,178 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-12-02 13:53:05,178 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:53:05,179 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:53:05,179 INFO L85 PathProgramCache]: Analyzing trace with hash 1584040592, now seen corresponding path program 1 times [2023-12-02 13:53:05,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:53:05,179 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598687183] [2023-12-02 13:53:05,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:53:05,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:53:05,198 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 13:53:05,199 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1628038473] [2023-12-02 13:53:05,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:53:05,199 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:53:05,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:53:05,206 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:53:05,207 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 13:53:05,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:53:05,267 INFO L262 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 13:53:05,268 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:53:05,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:53:05,291 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:53:05,291 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:53:05,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598687183] [2023-12-02 13:53:05,291 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 13:53:05,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1628038473] [2023-12-02 13:53:05,292 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1628038473] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:53:05,292 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:53:05,292 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 13:53:05,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184905000] [2023-12-02 13:53:05,292 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:53:05,293 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 13:53:05,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:53:05,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 13:53:05,294 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 13:53:05,294 INFO L87 Difference]: Start difference. First operand 15 states and 23 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 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) [2023-12-02 13:53:05,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:53:05,358 INFO L93 Difference]: Finished difference Result 40 states and 63 transitions. [2023-12-02 13:53:05,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 13:53:05,359 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 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 10 [2023-12-02 13:53:05,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:53:05,359 INFO L225 Difference]: With dead ends: 40 [2023-12-02 13:53:05,360 INFO L226 Difference]: Without dead ends: 27 [2023-12-02 13:53:05,360 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 13:53:05,362 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 29 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 13:53:05,362 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 8 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 13:53:05,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-12-02 13:53:05,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 18. [2023-12-02 13:53:05,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 17 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:53:05,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 26 transitions. [2023-12-02 13:53:05,369 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 26 transitions. Word has length 10 [2023-12-02 13:53:05,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:53:05,369 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 26 transitions. [2023-12-02 13:53:05,370 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 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) [2023-12-02 13:53:05,370 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 26 transitions. [2023-12-02 13:53:05,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-12-02 13:53:05,370 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:53:05,370 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:53:05,376 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 13:53:05,576 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:53:05,576 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:53:05,577 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:53:05,577 INFO L85 PathProgramCache]: Analyzing trace with hash 69036690, now seen corresponding path program 1 times [2023-12-02 13:53:05,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:53:05,577 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067710122] [2023-12-02 13:53:05,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:53:05,578 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:53:05,587 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 13:53:05,588 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [419503718] [2023-12-02 13:53:05,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:53:05,588 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:53:05,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:53:05,589 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:53:05,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 13:53:05,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:53:05,646 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 13:53:05,648 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:53:05,669 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:53:05,669 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:53:05,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:53:05,669 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067710122] [2023-12-02 13:53:05,669 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 13:53:05,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [419503718] [2023-12-02 13:53:05,670 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [419503718] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:53:05,670 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:53:05,670 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 13:53:05,670 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412704179] [2023-12-02 13:53:05,670 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:53:05,671 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 13:53:05,671 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:53:05,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 13:53:05,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 13:53:05,672 INFO L87 Difference]: Start difference. First operand 18 states and 26 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 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 13:53:05,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:53:05,732 INFO L93 Difference]: Finished difference Result 43 states and 63 transitions. [2023-12-02 13:53:05,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 13:53:05,733 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-12-02 13:53:05,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:53:05,734 INFO L225 Difference]: With dead ends: 43 [2023-12-02 13:53:05,734 INFO L226 Difference]: Without dead ends: 27 [2023-12-02 13:53:05,734 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 13:53:05,735 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 35 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 13:53:05,736 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 6 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 13:53:05,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-12-02 13:53:05,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 21. [2023-12-02 13:53:05,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:53:05,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 29 transitions. [2023-12-02 13:53:05,743 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 29 transitions. Word has length 12 [2023-12-02 13:53:05,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:53:05,744 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 29 transitions. [2023-12-02 13:53:05,744 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 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 13:53:05,744 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 29 transitions. [2023-12-02 13:53:05,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 13:53:05,745 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:53:05,745 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:53:05,750 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-12-02 13:53:05,948 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:53:05,948 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:53:05,949 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:53:05,949 INFO L85 PathProgramCache]: Analyzing trace with hash -1108007499, now seen corresponding path program 1 times [2023-12-02 13:53:05,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:53:05,949 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452162189] [2023-12-02 13:53:05,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:53:05,949 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:53:05,958 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 13:53:05,958 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [361877799] [2023-12-02 13:53:05,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:53:05,958 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:53:05,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:53:05,960 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:53:05,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 13:53:06,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:53:06,041 INFO L262 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 13:53:06,042 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:53:06,078 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:53:06,079 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:53:06,110 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:53:06,110 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:53:06,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452162189] [2023-12-02 13:53:06,111 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 13:53:06,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [361877799] [2023-12-02 13:53:06,111 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [361877799] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:53:06,112 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [824576523] [2023-12-02 13:53:06,132 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 13:53:06,132 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:53:06,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:53:06,141 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:53:06,142 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:53:07,505 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:53:08,002 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [824576523] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:53:08,002 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 13:53:08,002 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4, 4] total 11 [2023-12-02 13:53:08,003 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066212132] [2023-12-02 13:53:08,003 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:53:08,003 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 13:53:08,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:53:08,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 13:53:08,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=84, Unknown=0, NotChecked=0, Total=132 [2023-12-02 13:53:08,004 INFO L87 Difference]: Start difference. First operand 21 states and 29 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 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 13:53:08,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:53:08,350 INFO L93 Difference]: Finished difference Result 42 states and 53 transitions. [2023-12-02 13:53:08,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 13:53:08,351 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-12-02 13:53:08,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:53:08,351 INFO L225 Difference]: With dead ends: 42 [2023-12-02 13:53:08,351 INFO L226 Difference]: Without dead ends: 33 [2023-12-02 13:53:08,352 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2023-12-02 13:53:08,353 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 13:53:08,354 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 9 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 13:53:08,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-12-02 13:53:08,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 22. [2023-12-02 13:53:08,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 21 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:53:08,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 30 transitions. [2023-12-02 13:53:08,368 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 30 transitions. Word has length 13 [2023-12-02 13:53:08,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:53:08,368 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 30 transitions. [2023-12-02 13:53:08,368 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 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 13:53:08,368 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 30 transitions. [2023-12-02 13:53:08,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-12-02 13:53:08,369 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:53:08,369 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:53:08,375 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 13:53:08,575 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:53:08,575 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:53:08,575 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:53:08,575 INFO L85 PathProgramCache]: Analyzing trace with hash -1755036182, now seen corresponding path program 1 times [2023-12-02 13:53:08,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:53:08,576 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819227614] [2023-12-02 13:53:08,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:53:08,576 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:53:08,584 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 13:53:08,585 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [316703243] [2023-12-02 13:53:08,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:53:08,585 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:53:08,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:53:08,586 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:53:08,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 13:53:08,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:53:08,649 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 13:53:08,651 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:53:08,680 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 13:53:08,680 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:53:08,703 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 13:53:08,704 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:53:08,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819227614] [2023-12-02 13:53:08,704 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 13:53:08,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [316703243] [2023-12-02 13:53:08,704 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [316703243] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:53:08,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1654620585] [2023-12-02 13:53:08,707 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 13:53:08,707 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:53:08,707 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:53:08,708 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:53:08,708 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:53:10,310 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:53:10,657 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '696#(and (= (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) (+ (* (* |ULTIMATE.start_main_~n~0#1| 4) (+ (- 1) |ULTIMATE.start_main_~n~0#1|)) |ULTIMATE.start_main_~#B~0#1.offset| (- 4) (* |ULTIMATE.start_main_~n~0#1| 4) (* (* |ULTIMATE.start_main_~n~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (+ (- 1) |ULTIMATE.start_main_~n~0#1|)))) |ULTIMATE.start_main_#t~mem7#1|) (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (exists ((|v_ULTIMATE.start_main_~k~0#1_126| Int) (|v_ULTIMATE.start_main_~i~0#1_76| Int) (|v_ULTIMATE.start_main_~j~0#1_99| Int)) (and (<= 0 |v_ULTIMATE.start_main_~k~0#1_126|) (<= |ULTIMATE.start_main_~n~0#1| |v_ULTIMATE.start_main_~i~0#1_76|) (<= 0 |v_ULTIMATE.start_main_~j~0#1_99|))) (= |ULTIMATE.start_main_~k~0#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) |ULTIMATE.start_main_~#A~0#1.offset|)) (<= 1 |ULTIMATE.start_main_~n~0#1|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-12-02 13:53:10,657 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:53:10,657 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 13:53:10,657 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2023-12-02 13:53:10,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300791339] [2023-12-02 13:53:10,658 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 13:53:10,658 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 13:53:10,658 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:53:10,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 13:53:10,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=200, Unknown=0, NotChecked=0, Total=272 [2023-12-02 13:53:10,659 INFO L87 Difference]: Start difference. First operand 22 states and 30 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:53:10,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:53:10,756 INFO L93 Difference]: Finished difference Result 64 states and 89 transitions. [2023-12-02 13:53:10,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 13:53:10,756 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-12-02 13:53:10,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:53:10,757 INFO L225 Difference]: With dead ends: 64 [2023-12-02 13:53:10,757 INFO L226 Difference]: Without dead ends: 44 [2023-12-02 13:53:10,758 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=88, Invalid=254, Unknown=0, NotChecked=0, Total=342 [2023-12-02 13:53:10,758 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 90 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:53:10,759 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 12 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:53:10,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-12-02 13:53:10,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 37. [2023-12-02 13:53:10,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.3333333333333333) internal successors, (48), 36 states have internal predecessors, (48), 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 13:53:10,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 48 transitions. [2023-12-02 13:53:10,770 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 48 transitions. Word has length 18 [2023-12-02 13:53:10,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:53:10,771 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 48 transitions. [2023-12-02 13:53:10,771 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:53:10,771 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 48 transitions. [2023-12-02 13:53:10,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-12-02 13:53:10,771 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:53:10,772 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:53:10,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-12-02 13:53:10,972 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:53:10,972 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:53:10,972 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:53:10,973 INFO L85 PathProgramCache]: Analyzing trace with hash -1737284649, now seen corresponding path program 2 times [2023-12-02 13:53:10,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:53:10,973 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [499917167] [2023-12-02 13:53:10,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:53:10,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:53:10,984 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 13:53:10,984 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [334374322] [2023-12-02 13:53:10,984 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 13:53:10,984 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:53:10,984 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:53:10,985 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:53:10,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 13:53:11,055 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 13:53:11,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 13:53:11,056 INFO L262 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 13:53:11,057 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:53:11,111 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 13:53:11,111 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:53:11,150 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 13:53:11,150 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:53:11,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [499917167] [2023-12-02 13:53:11,151 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 13:53:11,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [334374322] [2023-12-02 13:53:11,151 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [334374322] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:53:11,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1676933402] [2023-12-02 13:53:11,153 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 13:53:11,154 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:53:11,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:53:11,154 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:53:11,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:53:12,338 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:53:12,760 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1025#(and (= (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) (+ (* (* |ULTIMATE.start_main_~n~0#1| 4) (+ (- 1) |ULTIMATE.start_main_~n~0#1|)) |ULTIMATE.start_main_~#B~0#1.offset| (- 4) (* |ULTIMATE.start_main_~n~0#1| 4) (* (* |ULTIMATE.start_main_~n~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (+ (- 1) |ULTIMATE.start_main_~n~0#1|)))) |ULTIMATE.start_main_#t~mem7#1|) (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~k~0#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) |ULTIMATE.start_main_~#A~0#1.offset|)) (<= 1 |ULTIMATE.start_main_~n~0#1|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-12-02 13:53:12,760 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:53:12,760 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 13:53:12,760 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2023-12-02 13:53:12,760 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760050827] [2023-12-02 13:53:12,760 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 13:53:12,761 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 13:53:12,761 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:53:12,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 13:53:12,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2023-12-02 13:53:12,762 INFO L87 Difference]: Start difference. First operand 37 states and 48 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 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) [2023-12-02 13:53:12,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:53:12,923 INFO L93 Difference]: Finished difference Result 167 states and 219 transitions. [2023-12-02 13:53:12,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 13:53:12,924 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 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 24 [2023-12-02 13:53:12,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:53:12,926 INFO L225 Difference]: With dead ends: 167 [2023-12-02 13:53:12,926 INFO L226 Difference]: Without dead ends: 140 [2023-12-02 13:53:12,927 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=96, Invalid=284, Unknown=0, NotChecked=0, Total=380 [2023-12-02 13:53:12,928 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 170 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:53:12,928 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [170 Valid, 16 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:53:12,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2023-12-02 13:53:12,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 85. [2023-12-02 13:53:12,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.2857142857142858) internal successors, (108), 84 states have internal predecessors, (108), 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 13:53:12,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 108 transitions. [2023-12-02 13:53:12,956 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 108 transitions. Word has length 24 [2023-12-02 13:53:12,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:53:12,957 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 108 transitions. [2023-12-02 13:53:12,957 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 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) [2023-12-02 13:53:12,957 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 108 transitions. [2023-12-02 13:53:12,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2023-12-02 13:53:12,959 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:53:12,959 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:53:12,963 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 13:53:13,159 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:53:13,160 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:53:13,160 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:53:13,160 INFO L85 PathProgramCache]: Analyzing trace with hash 718722687, now seen corresponding path program 3 times [2023-12-02 13:53:13,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:53:13,160 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [32532462] [2023-12-02 13:53:13,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:53:13,161 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:53:13,185 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 13:53:13,185 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [132312556] [2023-12-02 13:53:13,185 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 13:53:13,186 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:53:13,186 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:53:13,186 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:53:13,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 13:53:13,297 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 13:53:13,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 13:53:13,300 INFO L262 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 13:53:13,303 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:53:13,365 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 52 proven. 88 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2023-12-02 13:53:13,365 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:53:13,424 INFO L134 CoverageAnalysis]: Checked inductivity of 456 backedges. 52 proven. 88 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2023-12-02 13:53:13,425 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:53:13,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [32532462] [2023-12-02 13:53:13,425 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 13:53:13,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [132312556] [2023-12-02 13:53:13,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [132312556] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:53:13,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1516511719] [2023-12-02 13:53:13,427 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 13:53:13,428 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:53:13,428 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:53:13,428 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:53:13,428 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:53:14,615 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:53:15,021 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1916#(and (= (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) (+ (* (* |ULTIMATE.start_main_~n~0#1| 4) (+ (- 1) |ULTIMATE.start_main_~n~0#1|)) |ULTIMATE.start_main_~#B~0#1.offset| (- 4) (* |ULTIMATE.start_main_~n~0#1| 4) (* (* |ULTIMATE.start_main_~n~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (+ (- 1) |ULTIMATE.start_main_~n~0#1|)))) |ULTIMATE.start_main_#t~mem7#1|) (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~k~0#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) |ULTIMATE.start_main_~#A~0#1.offset|)) (<= 1 |ULTIMATE.start_main_~n~0#1|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-12-02 13:53:15,021 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:53:15,021 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 13:53:15,021 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2023-12-02 13:53:15,021 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871544951] [2023-12-02 13:53:15,022 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 13:53:15,022 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 13:53:15,022 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:53:15,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 13:53:15,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2023-12-02 13:53:15,023 INFO L87 Difference]: Start difference. First operand 85 states and 108 transitions. Second operand has 9 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 9 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 13:53:15,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:53:15,249 INFO L93 Difference]: Finished difference Result 318 states and 397 transitions. [2023-12-02 13:53:15,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-12-02 13:53:15,249 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 9 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 72 [2023-12-02 13:53:15,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:53:15,251 INFO L225 Difference]: With dead ends: 318 [2023-12-02 13:53:15,251 INFO L226 Difference]: Without dead ends: 213 [2023-12-02 13:53:15,253 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 194 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2023-12-02 13:53:15,253 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 65 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:53:15,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 22 Invalid, 186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:53:15,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2023-12-02 13:53:15,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 152. [2023-12-02 13:53:15,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.2582781456953642) internal successors, (190), 151 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:53:15,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 190 transitions. [2023-12-02 13:53:15,311 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 190 transitions. Word has length 72 [2023-12-02 13:53:15,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:53:15,311 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 190 transitions. [2023-12-02 13:53:15,312 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 9 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 13:53:15,312 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 190 transitions. [2023-12-02 13:53:15,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-12-02 13:53:15,314 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:53:15,314 INFO L195 NwaCegarLoop]: trace histogram [32, 28, 8, 8, 7, 7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:53:15,320 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-12-02 13:53:15,516 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-12-02 13:53:15,516 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:53:15,517 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:53:15,517 INFO L85 PathProgramCache]: Analyzing trace with hash -1743645362, now seen corresponding path program 4 times [2023-12-02 13:53:15,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:53:15,517 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [6635305] [2023-12-02 13:53:15,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:53:15,517 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:53:15,553 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 13:53:15,553 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [82576308] [2023-12-02 13:53:15,554 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 13:53:15,554 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:53:15,554 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:53:15,555 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:53:15,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 13:53:15,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:53:15,740 INFO L262 TraceCheckSpWp]: Trace formula consists of 723 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 13:53:15,745 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:53:15,793 INFO L134 CoverageAnalysis]: Checked inductivity of 1516 backedges. 190 proven. 10 refuted. 0 times theorem prover too weak. 1316 trivial. 0 not checked. [2023-12-02 13:53:15,793 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:53:15,841 INFO L134 CoverageAnalysis]: Checked inductivity of 1516 backedges. 190 proven. 10 refuted. 0 times theorem prover too weak. 1316 trivial. 0 not checked. [2023-12-02 13:53:15,841 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:53:15,841 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [6635305] [2023-12-02 13:53:15,841 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-12-02 13:53:15,841 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [82576308] [2023-12-02 13:53:15,841 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [82576308] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:53:15,841 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [305076837] [2023-12-02 13:53:15,843 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-12-02 13:53:15,843 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:53:15,843 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:53:15,843 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:53:15,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:53:17,133 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:53:17,573 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3501#(and (= (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) (+ (* (* |ULTIMATE.start_main_~n~0#1| 4) (+ (- 1) |ULTIMATE.start_main_~n~0#1|)) |ULTIMATE.start_main_~#B~0#1.offset| (- 4) (* |ULTIMATE.start_main_~n~0#1| 4) (* (* |ULTIMATE.start_main_~n~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (+ (- 1) |ULTIMATE.start_main_~n~0#1|)))) |ULTIMATE.start_main_#t~mem7#1|) (= |ULTIMATE.start_main_~i~0#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~k~0#1| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) |ULTIMATE.start_main_~#A~0#1.offset|)) (<= 1 |ULTIMATE.start_main_~n~0#1|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-12-02 13:53:17,573 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:53:17,573 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-12-02 13:53:17,573 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 13 [2023-12-02 13:53:17,574 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846102853] [2023-12-02 13:53:17,574 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-12-02 13:53:17,574 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 13:53:17,574 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:53:17,575 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 13:53:17,575 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2023-12-02 13:53:17,575 INFO L87 Difference]: Start difference. First operand 152 states and 190 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 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 13:53:17,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:53:17,855 INFO L93 Difference]: Finished difference Result 448 states and 634 transitions. [2023-12-02 13:53:17,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-12-02 13:53:17,855 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 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) Word has length 114 [2023-12-02 13:53:17,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:53:17,857 INFO L225 Difference]: With dead ends: 448 [2023-12-02 13:53:17,858 INFO L226 Difference]: Without dead ends: 304 [2023-12-02 13:53:17,859 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=206, Invalid=606, Unknown=0, NotChecked=0, Total=812 [2023-12-02 13:53:17,860 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 123 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:53:17,860 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 30 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:53:17,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2023-12-02 13:53:17,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 284. [2023-12-02 13:53:17,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 283 states have (on average 1.1802120141342756) internal successors, (334), 283 states have internal predecessors, (334), 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 13:53:17,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 334 transitions. [2023-12-02 13:53:17,938 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 334 transitions. Word has length 114 [2023-12-02 13:53:17,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:53:17,938 INFO L495 AbstractCegarLoop]: Abstraction has 284 states and 334 transitions. [2023-12-02 13:53:17,938 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 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 13:53:17,938 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 334 transitions. [2023-12-02 13:53:17,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2023-12-02 13:53:17,941 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:53:17,942 INFO L195 NwaCegarLoop]: trace histogram [80, 70, 8, 8, 7, 7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:53:17,948 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 13:53:18,148 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-12-02 13:53:18,148 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:53:18,149 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:53:18,149 INFO L85 PathProgramCache]: Analyzing trace with hash 840012046, now seen corresponding path program 5 times [2023-12-02 13:53:18,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:53:18,149 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219883241] [2023-12-02 13:53:18,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:53:18,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:53:18,220 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-12-02 13:53:18,220 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1252781862] [2023-12-02 13:53:18,220 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 13:53:18,220 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:53:18,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:53:18,221 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:53:18,222 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a0c68007-27d5-45ab-8fcc-1bde2b89c764/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process