./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_partition_ground-2.i --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_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/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_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_partition_ground-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/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_6d20bc92-838e-4464-84a8-7ac398ba538b/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 fcf72d109deb69f1acda4466c7376bd6c362d474983f8a50a2faed8c0a192a76 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 13:07:18,060 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 13:07:18,123 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 13:07:18,128 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 13:07:18,128 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 13:07:18,152 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 13:07:18,152 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 13:07:18,153 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 13:07:18,153 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 13:07:18,154 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 13:07:18,154 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 13:07:18,155 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 13:07:18,155 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 13:07:18,156 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 13:07:18,156 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 13:07:18,157 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 13:07:18,158 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 13:07:18,158 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 13:07:18,159 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 13:07:18,159 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 13:07:18,160 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 13:07:18,161 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 13:07:18,166 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 13:07:18,166 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 13:07:18,167 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 13:07:18,167 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 13:07:18,168 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 13:07:18,168 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 13:07:18,168 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 13:07:18,169 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 13:07:18,169 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 13:07:18,170 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 13:07:18,170 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 13:07:18,170 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 13:07:18,171 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 13:07:18,171 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 13:07:18,171 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 13:07:18,171 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 13:07:18,172 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 13:07:18,172 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 13:07:18,172 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 13:07:18,172 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 13:07:18,173 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 13:07:18,173 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 13:07:18,173 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 13:07:18,173 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 13:07:18,173 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 13:07:18,173 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_6d20bc92-838e-4464-84a8-7ac398ba538b/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fcf72d109deb69f1acda4466c7376bd6c362d474983f8a50a2faed8c0a192a76 [2023-12-02 13:07:18,382 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 13:07:18,401 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 13:07:18,404 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 13:07:18,405 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 13:07:18,406 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 13:07:18,407 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-examples/standard_partition_ground-2.i [2023-12-02 13:07:21,178 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 13:07:21,352 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 13:07:21,353 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/sv-benchmarks/c/array-examples/standard_partition_ground-2.i [2023-12-02 13:07:21,359 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/data/d89caa0ae/f3f28c933cff4d4eb1680ffbcf56c2bd/FLAG5946a6c05 [2023-12-02 13:07:21,372 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/data/d89caa0ae/f3f28c933cff4d4eb1680ffbcf56c2bd [2023-12-02 13:07:21,374 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 13:07:21,376 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 13:07:21,377 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 13:07:21,377 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 13:07:21,382 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 13:07:21,383 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 01:07:21" (1/1) ... [2023-12-02 13:07:21,384 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@14c92da1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:07:21, skipping insertion in model container [2023-12-02 13:07:21,385 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 01:07:21" (1/1) ... [2023-12-02 13:07:21,407 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 13:07:21,554 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_6d20bc92-838e-4464-84a8-7ac398ba538b/sv-benchmarks/c/array-examples/standard_partition_ground-2.i[820,833] [2023-12-02 13:07:21,571 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 13:07:21,581 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 13:07:21,594 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_6d20bc92-838e-4464-84a8-7ac398ba538b/sv-benchmarks/c/array-examples/standard_partition_ground-2.i[820,833] [2023-12-02 13:07:21,602 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 13:07:21,617 INFO L206 MainTranslator]: Completed translation [2023-12-02 13:07:21,618 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:07:21 WrapperNode [2023-12-02 13:07:21,618 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 13:07:21,619 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 13:07:21,619 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 13:07:21,619 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 13:07:21,626 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:07:21" (1/1) ... [2023-12-02 13:07:21,633 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:07:21" (1/1) ... [2023-12-02 13:07:21,653 INFO L138 Inliner]: procedures = 16, calls = 20, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 81 [2023-12-02 13:07:21,653 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 13:07:21,654 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 13:07:21,654 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 13:07:21,654 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 13:07:21,662 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:07:21" (1/1) ... [2023-12-02 13:07:21,662 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:07:21" (1/1) ... [2023-12-02 13:07:21,664 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:07:21" (1/1) ... [2023-12-02 13:07:21,664 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:07:21" (1/1) ... [2023-12-02 13:07:21,670 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:07:21" (1/1) ... [2023-12-02 13:07:21,674 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:07:21" (1/1) ... [2023-12-02 13:07:21,676 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:07:21" (1/1) ... [2023-12-02 13:07:21,677 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:07:21" (1/1) ... [2023-12-02 13:07:21,679 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 13:07:21,680 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 13:07:21,680 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 13:07:21,681 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 13:07:21,681 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:07:21" (1/1) ... [2023-12-02 13:07:21,687 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 13:07:21,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:07:21,711 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 13:07:21,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 13:07:21,752 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 13:07:21,753 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 13:07:21,753 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 13:07:21,753 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 13:07:21,753 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 13:07:21,753 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 13:07:21,753 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 13:07:21,754 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 13:07:21,829 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 13:07:21,832 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 13:07:21,982 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 13:07:22,055 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 13:07:22,055 INFO L309 CfgBuilder]: Removed 4 assume(true) statements. [2023-12-02 13:07:22,056 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 01:07:22 BoogieIcfgContainer [2023-12-02 13:07:22,057 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 13:07:22,059 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 13:07:22,060 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 13:07:22,062 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 13:07:22,062 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 01:07:21" (1/3) ... [2023-12-02 13:07:22,063 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78c831c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 01:07:22, skipping insertion in model container [2023-12-02 13:07:22,063 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 01:07:21" (2/3) ... [2023-12-02 13:07:22,063 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78c831c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 01:07:22, skipping insertion in model container [2023-12-02 13:07:22,063 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 01:07:22" (3/3) ... [2023-12-02 13:07:22,065 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_partition_ground-2.i [2023-12-02 13:07:22,078 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 13:07:22,079 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 13:07:22,117 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 13:07:22,122 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;@4728f64d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 13:07:22,122 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 13:07:22,126 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.75) internal successors, (14), 9 states have internal predecessors, (14), 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 13:07:22,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 13:07:22,131 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:07:22,131 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:07:22,132 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:07:22,136 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:07:22,136 INFO L85 PathProgramCache]: Analyzing trace with hash -668387249, now seen corresponding path program 1 times [2023-12-02 13:07:22,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:07:22,143 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [72204757] [2023-12-02 13:07:22,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:07:22,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:07:22,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:07:22,340 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 13:07:22,341 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:07:22,341 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [72204757] [2023-12-02 13:07:22,342 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [72204757] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:07:22,342 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 13:07:22,342 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 13:07:22,344 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139061284] [2023-12-02 13:07:22,344 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:07:22,348 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:07:22,348 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:07:22,372 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:07:22,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 13:07:22,374 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.75) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:07:22,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:07:22,413 INFO L93 Difference]: Finished difference Result 19 states and 27 transitions. [2023-12-02 13:07:22,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:07:22,416 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 13:07:22,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:07:22,423 INFO L225 Difference]: With dead ends: 19 [2023-12-02 13:07:22,423 INFO L226 Difference]: Without dead ends: 10 [2023-12-02 13:07:22,426 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 13:07:22,429 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 13:07:22,430 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 13:07:22,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2023-12-02 13:07:22,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2023-12-02 13:07:22,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:07:22,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 13 transitions. [2023-12-02 13:07:22,453 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 13 transitions. Word has length 7 [2023-12-02 13:07:22,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:07:22,453 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 13 transitions. [2023-12-02 13:07:22,454 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:07:22,454 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 13 transitions. [2023-12-02 13:07:22,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 13:07:22,454 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:07:22,454 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:07:22,455 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 13:07:22,455 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:07:22,456 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:07:22,456 INFO L85 PathProgramCache]: Analyzing trace with hash 1409156061, now seen corresponding path program 1 times [2023-12-02 13:07:22,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:07:22,456 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424998742] [2023-12-02 13:07:22,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:07:22,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:07:22,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:07:22,540 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 13:07:22,541 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:07:22,541 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424998742] [2023-12-02 13:07:22,541 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1424998742] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:07:22,541 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [267621912] [2023-12-02 13:07:22,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:07:22,542 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:22,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:07:22,543 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:07:22,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 13:07:22,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:07:22,617 INFO L262 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 13:07:22,621 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:07:22,643 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 13:07:22,644 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 13:07:22,644 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [267621912] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 13:07:22,644 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 13:07:22,644 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2023-12-02 13:07:22,645 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335666679] [2023-12-02 13:07:22,645 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 13:07:22,646 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 13:07:22,646 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:07:22,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 13:07:22,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 13:07:22,647 INFO L87 Difference]: Start difference. First operand 10 states and 13 transitions. 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 13:07:22,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:07:22,669 INFO L93 Difference]: Finished difference Result 18 states and 24 transitions. [2023-12-02 13:07:22,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 13:07:22,670 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 13:07:22,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:07:22,670 INFO L225 Difference]: With dead ends: 18 [2023-12-02 13:07:22,670 INFO L226 Difference]: Without dead ends: 12 [2023-12-02 13:07:22,671 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 13:07:22,672 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 13:07:22,673 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 13:07:22,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-12-02 13:07:22,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-12-02 13:07:22,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:07:22,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2023-12-02 13:07:22,677 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 8 [2023-12-02 13:07:22,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:07:22,677 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2023-12-02 13:07:22,677 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 13:07:22,678 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2023-12-02 13:07:22,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-12-02 13:07:22,678 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:07:22,678 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:07:22,688 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 13:07:22,879 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:22,879 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:07:22,880 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:07:22,880 INFO L85 PathProgramCache]: Analyzing trace with hash -656848256, now seen corresponding path program 1 times [2023-12-02 13:07:22,880 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:07:22,880 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810872519] [2023-12-02 13:07:22,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:07:22,880 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:07:22,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:07:22,966 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 13:07:22,966 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:07:22,967 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810872519] [2023-12-02 13:07:22,967 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [810872519] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:07:22,967 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1348911691] [2023-12-02 13:07:22,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:07:22,968 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:22,968 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:07:22,969 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:07:22,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 13:07:23,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:07:23,037 INFO L262 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 13:07:23,038 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:07:23,068 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 13:07:23,068 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:07:23,089 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 13:07:23,090 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1348911691] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:07:23,090 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1513584861] [2023-12-02 13:07:23,110 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 13:07:23,110 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:07:23,113 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:07:23,117 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:07:23,118 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:07:23,636 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:07:23,782 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '191#(and (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#bb~0#1.base|) |ULTIMATE.start_main_~#bb~0#1.offset|)) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) 0) (<= 1 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 13:07:23,783 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:07:23,783 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:07:23,783 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-12-02 13:07:23,783 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049033108] [2023-12-02 13:07:23,784 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:07:23,784 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 13:07:23,784 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:07:23,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 13:07:23,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2023-12-02 13:07:23,786 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:07:23,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:07:23,834 INFO L93 Difference]: Finished difference Result 24 states and 32 transitions. [2023-12-02 13:07:23,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 13:07:23,835 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-12-02 13:07:23,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:07:23,836 INFO L225 Difference]: With dead ends: 24 [2023-12-02 13:07:23,836 INFO L226 Difference]: Without dead ends: 15 [2023-12-02 13:07:23,837 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=94, Unknown=0, NotChecked=0, Total=132 [2023-12-02 13:07:23,838 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 13:07:23,839 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 20 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 13:07:23,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-12-02 13:07:23,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-12-02 13:07:23,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:07:23,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-12-02 13:07:23,844 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 10 [2023-12-02 13:07:23,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:07:23,845 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-12-02 13:07:23,845 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:07:23,845 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-12-02 13:07:23,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-12-02 13:07:23,846 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:07:23,846 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:07:23,851 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 13:07:24,046 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:24,047 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:07:24,047 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:07:24,047 INFO L85 PathProgramCache]: Analyzing trace with hash 35110386, now seen corresponding path program 2 times [2023-12-02 13:07:24,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:07:24,048 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [875579088] [2023-12-02 13:07:24,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:07:24,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:07:24,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:07:24,163 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 13:07:24,163 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:07:24,163 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [875579088] [2023-12-02 13:07:24,163 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [875579088] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:07:24,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [483745083] [2023-12-02 13:07:24,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 13:07:24,164 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:24,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:07:24,165 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:07:24,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 13:07:24,232 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 13:07:24,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 13:07:24,233 INFO L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 13:07:24,234 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:07:24,251 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 13:07:24,251 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:07:24,273 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 13:07:24,274 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [483745083] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:07:24,274 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1491102083] [2023-12-02 13:07:24,276 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 13:07:24,276 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:07:24,277 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:07:24,277 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:07:24,277 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:07:24,577 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:07:24,693 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '339#(and (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#bb~0#1.base|) |ULTIMATE.start_main_~#bb~0#1.offset|)) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) 0) (<= 1 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 13:07:24,693 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:07:24,694 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:07:24,694 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-12-02 13:07:24,694 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611616932] [2023-12-02 13:07:24,694 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:07:24,694 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 13:07:24,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:07:24,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 13:07:24,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2023-12-02 13:07:24,696 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:07:24,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:07:24,738 INFO L93 Difference]: Finished difference Result 28 states and 38 transitions. [2023-12-02 13:07:24,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 13:07:24,738 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-12-02 13:07:24,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:07:24,739 INFO L225 Difference]: With dead ends: 28 [2023-12-02 13:07:24,739 INFO L226 Difference]: Without dead ends: 21 [2023-12-02 13:07:24,739 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2023-12-02 13:07:24,740 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 13:07:24,741 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 13:07:24,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-12-02 13:07:24,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-12-02 13:07:24,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.2) internal successors, (24), 20 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 13:07:24,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2023-12-02 13:07:24,746 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 13 [2023-12-02 13:07:24,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:07:24,746 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2023-12-02 13:07:24,746 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:07:24,747 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2023-12-02 13:07:24,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-12-02 13:07:24,747 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:07:24,747 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:07:24,753 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 13:07:24,951 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:24,952 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:07:24,952 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:07:24,952 INFO L85 PathProgramCache]: Analyzing trace with hash -2004393457, now seen corresponding path program 3 times [2023-12-02 13:07:24,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:07:24,952 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2013924539] [2023-12-02 13:07:24,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:07:24,953 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:07:24,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:07:25,096 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 13:07:25,096 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:07:25,096 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2013924539] [2023-12-02 13:07:25,096 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2013924539] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:07:25,096 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2076439904] [2023-12-02 13:07:25,097 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 13:07:25,097 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:25,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:07:25,102 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:07:25,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 13:07:25,184 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 13:07:25,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 13:07:25,186 INFO L262 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 13:07:25,187 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:07:25,203 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 13:07:25,203 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:07:25,260 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 13:07:25,260 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2076439904] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:07:25,260 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [82205282] [2023-12-02 13:07:25,263 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 13:07:25,263 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:07:25,263 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:07:25,263 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:07:25,263 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:07:25,507 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:07:25,622 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '549#(and (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#bb~0#1.base|) |ULTIMATE.start_main_~#bb~0#1.offset|)) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) 0) (<= 1 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 13:07:25,623 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:07:25,623 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:07:25,623 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-12-02 13:07:25,623 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379804089] [2023-12-02 13:07:25,623 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:07:25,624 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 13:07:25,624 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:07:25,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 13:07:25,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=211, Unknown=0, NotChecked=0, Total=306 [2023-12-02 13:07:25,625 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:07:25,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:07:25,667 INFO L93 Difference]: Finished difference Result 42 states and 53 transitions. [2023-12-02 13:07:25,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 13:07:25,668 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-12-02 13:07:25,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:07:25,668 INFO L225 Difference]: With dead ends: 42 [2023-12-02 13:07:25,669 INFO L226 Difference]: Without dead ends: 27 [2023-12-02 13:07:25,669 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=95, Invalid=211, Unknown=0, NotChecked=0, Total=306 [2023-12-02 13:07:25,670 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 13:07:25,671 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 13:07:25,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-12-02 13:07:25,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-12-02 13:07:25,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 26 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 13:07:25,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2023-12-02 13:07:25,677 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 19 [2023-12-02 13:07:25,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:07:25,677 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2023-12-02 13:07:25,678 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:07:25,678 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2023-12-02 13:07:25,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-12-02 13:07:25,679 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:07:25,679 INFO L195 NwaCegarLoop]: trace histogram [10, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:07:25,685 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 13:07:25,885 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:25,885 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:07:25,885 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:07:25,886 INFO L85 PathProgramCache]: Analyzing trace with hash -99514545, now seen corresponding path program 4 times [2023-12-02 13:07:25,886 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:07:25,886 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387103514] [2023-12-02 13:07:25,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:07:25,886 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:07:25,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:07:26,165 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 13:07:26,165 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:07:26,166 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387103514] [2023-12-02 13:07:26,166 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1387103514] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:07:26,166 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567039044] [2023-12-02 13:07:26,166 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 13:07:26,166 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:26,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:07:26,167 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:07:26,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 13:07:26,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:07:26,275 INFO L262 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 13:07:26,277 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:07:26,306 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 13:07:26,306 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:07:26,512 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 13:07:26,512 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1567039044] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:07:26,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [823616552] [2023-12-02 13:07:26,515 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 13:07:26,515 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:07:26,515 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:07:26,515 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:07:26,515 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:07:26,741 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:07:26,874 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '847#(and (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#bb~0#1.base|) |ULTIMATE.start_main_~#bb~0#1.offset|)) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) 0) (<= 1 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 13:07:26,875 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:07:26,875 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:07:26,875 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2023-12-02 13:07:26,875 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352230511] [2023-12-02 13:07:26,875 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:07:26,876 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-12-02 13:07:26,876 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:07:26,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-12-02 13:07:26,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=553, Unknown=0, NotChecked=0, Total=870 [2023-12-02 13:07:26,877 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:07:26,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:07:26,936 INFO L93 Difference]: Finished difference Result 54 states and 71 transitions. [2023-12-02 13:07:26,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-12-02 13:07:26,937 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2023-12-02 13:07:26,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:07:26,938 INFO L225 Difference]: With dead ends: 54 [2023-12-02 13:07:26,938 INFO L226 Difference]: Without dead ends: 39 [2023-12-02 13:07:26,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=317, Invalid=553, Unknown=0, NotChecked=0, Total=870 [2023-12-02 13:07:26,939 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 13:07:26,940 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 13:07:26,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-12-02 13:07:26,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2023-12-02 13:07:26,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.105263157894737) internal successors, (42), 38 states have internal predecessors, (42), 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 13:07:26,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2023-12-02 13:07:26,947 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 25 [2023-12-02 13:07:26,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:07:26,947 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2023-12-02 13:07:26,947 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 24 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:07:26,947 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2023-12-02 13:07:26,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-12-02 13:07:26,948 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:07:26,949 INFO L195 NwaCegarLoop]: trace histogram [22, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:07:26,955 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 13:07:27,151 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:27,152 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:07:27,152 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:07:27,152 INFO L85 PathProgramCache]: Analyzing trace with hash 527892943, now seen corresponding path program 5 times [2023-12-02 13:07:27,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:07:27,152 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931820502] [2023-12-02 13:07:27,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:07:27,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:07:27,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:07:27,701 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 13:07:27,701 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:07:27,702 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931820502] [2023-12-02 13:07:27,702 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [931820502] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:07:27,702 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2118810521] [2023-12-02 13:07:27,702 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 13:07:27,702 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:27,702 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:07:27,703 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:07:27,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 13:07:27,831 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 13:07:27,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 13:07:27,832 INFO L262 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 13:07:27,834 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:07:27,948 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 263 trivial. 0 not checked. [2023-12-02 13:07:27,948 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:07:28,098 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 263 trivial. 0 not checked. [2023-12-02 13:07:28,098 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2118810521] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:07:28,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1932580369] [2023-12-02 13:07:28,101 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 13:07:28,101 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:07:28,101 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:07:28,101 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:07:28,101 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:07:28,248 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:07:28,427 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1275#(and (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#bb~0#1.base|) |ULTIMATE.start_main_~#bb~0#1.offset|)) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) 0) (<= 1 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 13:07:28,428 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:07:28,428 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:07:28,428 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 6, 6] total 34 [2023-12-02 13:07:28,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502779527] [2023-12-02 13:07:28,428 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:07:28,429 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-12-02 13:07:28,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:07:28,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-12-02 13:07:28,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=392, Invalid=1168, Unknown=0, NotChecked=0, Total=1560 [2023-12-02 13:07:28,431 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 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 13:07:28,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:07:28,855 INFO L93 Difference]: Finished difference Result 67 states and 85 transitions. [2023-12-02 13:07:28,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-12-02 13:07:28,856 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 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 37 [2023-12-02 13:07:28,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:07:28,857 INFO L225 Difference]: With dead ends: 67 [2023-12-02 13:07:28,857 INFO L226 Difference]: Without dead ends: 52 [2023-12-02 13:07:28,859 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 704 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1197, Invalid=2709, Unknown=0, NotChecked=0, Total=3906 [2023-12-02 13:07:28,860 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:07:28,860 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:07:28,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2023-12-02 13:07:28,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2023-12-02 13:07:28,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 51 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:07:28,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2023-12-02 13:07:28,869 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 37 [2023-12-02 13:07:28,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:07:28,870 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2023-12-02 13:07:28,870 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 34 states have internal predecessors, (47), 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 13:07:28,870 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2023-12-02 13:07:28,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-12-02 13:07:28,872 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:07:28,872 INFO L195 NwaCegarLoop]: trace histogram [23, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:07:28,877 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 13:07:29,072 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:29,073 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:07:29,073 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:07:29,073 INFO L85 PathProgramCache]: Analyzing trace with hash 1144924477, now seen corresponding path program 6 times [2023-12-02 13:07:29,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:07:29,073 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2128917266] [2023-12-02 13:07:29,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:07:29,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:07:29,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:07:29,855 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-12-02 13:07:29,857 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:07:29,857 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2128917266] [2023-12-02 13:07:29,857 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2128917266] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:07:29,857 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1963264030] [2023-12-02 13:07:29,858 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 13:07:29,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:29,858 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:07:29,859 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:07:29,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 13:07:30,004 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 13:07:30,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 13:07:30,007 INFO L262 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 25 conjunts are in the unsatisfiable core [2023-12-02 13:07:30,010 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:07:30,060 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-12-02 13:07:30,060 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:07:30,696 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-12-02 13:07:30,696 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1963264030] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:07:30,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1927399542] [2023-12-02 13:07:30,698 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 13:07:30,698 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:07:30,698 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:07:30,699 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:07:30,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:07:30,894 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:07:31,032 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1895#(and (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#bb~0#1.base|) |ULTIMATE.start_main_~#bb~0#1.offset|)) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) 0) (<= 1 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 13:07:31,032 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:07:31,032 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:07:31,032 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2023-12-02 13:07:31,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241613843] [2023-12-02 13:07:31,033 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:07:31,033 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-12-02 13:07:31,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:07:31,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-12-02 13:07:31,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1292, Invalid=1788, Unknown=0, NotChecked=0, Total=3080 [2023-12-02 13:07:31,036 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand has 51 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 50 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:07:31,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:07:31,118 INFO L93 Difference]: Finished difference Result 104 states and 134 transitions. [2023-12-02 13:07:31,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2023-12-02 13:07:31,119 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 50 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2023-12-02 13:07:31,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:07:31,120 INFO L225 Difference]: With dead ends: 104 [2023-12-02 13:07:31,120 INFO L226 Difference]: Without dead ends: 77 [2023-12-02 13:07:31,122 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1292, Invalid=1788, Unknown=0, NotChecked=0, Total=3080 [2023-12-02 13:07:31,122 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:07:31,123 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:07:31,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-12-02 13:07:31,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2023-12-02 13:07:31,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.0526315789473684) internal successors, (80), 76 states have internal predecessors, (80), 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 13:07:31,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2023-12-02 13:07:31,133 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 50 [2023-12-02 13:07:31,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:07:31,134 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2023-12-02 13:07:31,134 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 50 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 13:07:31,134 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2023-12-02 13:07:31,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-12-02 13:07:31,137 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:07:31,137 INFO L195 NwaCegarLoop]: trace histogram [48, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:07:31,144 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 13:07:31,337 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:31,338 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:07:31,338 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:07:31,338 INFO L85 PathProgramCache]: Analyzing trace with hash 1983505903, now seen corresponding path program 7 times [2023-12-02 13:07:31,338 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:07:31,338 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809160441] [2023-12-02 13:07:31,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:07:31,339 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:07:31,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:07:33,194 INFO L134 CoverageAnalysis]: Checked inductivity of 1286 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-12-02 13:07:33,194 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:07:33,194 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809160441] [2023-12-02 13:07:33,194 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [809160441] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:07:33,195 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1065397533] [2023-12-02 13:07:33,195 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 13:07:33,195 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:33,195 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:07:33,196 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:07:33,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 13:07:33,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:07:33,417 INFO L262 TraceCheckSpWp]: Trace formula consists of 626 conjuncts, 50 conjunts are in the unsatisfiable core [2023-12-02 13:07:33,421 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:07:33,500 INFO L134 CoverageAnalysis]: Checked inductivity of 1286 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-12-02 13:07:33,500 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:07:35,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1286 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-12-02 13:07:35,885 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1065397533] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:07:35,885 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1145347996] [2023-12-02 13:07:35,887 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 13:07:35,887 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:07:35,888 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:07:35,888 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:07:35,888 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:07:36,034 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:07:36,231 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2793#(and (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#bb~0#1.base|) |ULTIMATE.start_main_~#bb~0#1.offset|)) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) 0) (<= 1 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 13:07:36,231 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:07:36,231 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:07:36,231 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 100 [2023-12-02 13:07:36,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726994336] [2023-12-02 13:07:36,232 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:07:36,232 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2023-12-02 13:07:36,232 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:07:36,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2023-12-02 13:07:36,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5067, Invalid=6063, Unknown=0, NotChecked=0, Total=11130 [2023-12-02 13:07:36,239 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand has 101 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 100 states have internal predecessors, (109), 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 13:07:36,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:07:36,410 INFO L93 Difference]: Finished difference Result 154 states and 209 transitions. [2023-12-02 13:07:36,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2023-12-02 13:07:36,411 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 100 states have internal predecessors, (109), 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 75 [2023-12-02 13:07:36,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:07:36,412 INFO L225 Difference]: With dead ends: 154 [2023-12-02 13:07:36,412 INFO L226 Difference]: Without dead ends: 127 [2023-12-02 13:07:36,416 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 929 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=5067, Invalid=6063, Unknown=0, NotChecked=0, Total=11130 [2023-12-02 13:07:36,417 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 13:07:36,417 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 13:07:36,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2023-12-02 13:07:36,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2023-12-02 13:07:36,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 126 states have (on average 1.0317460317460319) internal successors, (130), 126 states have internal predecessors, (130), 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 13:07:36,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 130 transitions. [2023-12-02 13:07:36,430 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 130 transitions. Word has length 75 [2023-12-02 13:07:36,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:07:36,431 INFO L495 AbstractCegarLoop]: Abstraction has 127 states and 130 transitions. [2023-12-02 13:07:36,431 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 100 states have internal predecessors, (109), 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 13:07:36,431 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 130 transitions. [2023-12-02 13:07:36,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-12-02 13:07:36,433 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:07:36,434 INFO L195 NwaCegarLoop]: trace histogram [98, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:07:36,440 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 13:07:36,634 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:36,634 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:07:36,635 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:07:36,635 INFO L85 PathProgramCache]: Analyzing trace with hash 76865967, now seen corresponding path program 8 times [2023-12-02 13:07:36,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:07:36,635 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1239873310] [2023-12-02 13:07:36,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:07:36,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:07:36,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:07:42,444 INFO L134 CoverageAnalysis]: Checked inductivity of 4961 backedges. 0 proven. 4851 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-12-02 13:07:42,444 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:07:42,444 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1239873310] [2023-12-02 13:07:42,445 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1239873310] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:07:42,445 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [159081302] [2023-12-02 13:07:42,445 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 13:07:42,445 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:42,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:07:42,446 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:07:42,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 13:07:42,767 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-12-02 13:07:42,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 13:07:42,770 INFO L262 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 13:07:42,775 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:07:43,207 INFO L134 CoverageAnalysis]: Checked inductivity of 4961 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4906 trivial. 0 not checked. [2023-12-02 13:07:43,207 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:07:43,703 INFO L134 CoverageAnalysis]: Checked inductivity of 4961 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 4906 trivial. 0 not checked. [2023-12-02 13:07:43,703 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [159081302] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:07:43,703 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [206629594] [2023-12-02 13:07:43,705 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 13:07:43,705 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:07:43,705 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:07:43,706 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:07:43,706 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:07:43,849 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:07:44,198 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4213#(and (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#bb~0#1.base|) |ULTIMATE.start_main_~#bb~0#1.offset|)) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) 0) (<= 1 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 13:07:44,198 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:07:44,198 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:07:44,198 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 13, 13] total 123 [2023-12-02 13:07:44,199 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835994693] [2023-12-02 13:07:44,199 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:07:44,199 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2023-12-02 13:07:44,199 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:07:44,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2023-12-02 13:07:44,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5364, Invalid=10892, Unknown=0, NotChecked=0, Total=16256 [2023-12-02 13:07:44,206 INFO L87 Difference]: Start difference. First operand 127 states and 130 transitions. Second operand has 123 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 123 states have internal predecessors, (135), 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 13:07:48,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:07:48,366 INFO L93 Difference]: Finished difference Result 179 states and 209 transitions. [2023-12-02 13:07:48,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2023-12-02 13:07:48,367 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 123 states have internal predecessors, (135), 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 125 [2023-12-02 13:07:48,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:07:48,368 INFO L225 Difference]: With dead ends: 179 [2023-12-02 13:07:48,368 INFO L226 Difference]: Without dead ends: 152 [2023-12-02 13:07:48,374 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 347 SyntacticMatches, 0 SemanticMatches, 225 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7866 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=17541, Invalid=33761, Unknown=0, NotChecked=0, Total=51302 [2023-12-02 13:07:48,375 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 303 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 13:07:48,375 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [303 Valid, 40 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 13:07:48,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2023-12-02 13:07:48,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2023-12-02 13:07:48,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 151 states have (on average 1.0264900662251655) internal successors, (155), 151 states have internal predecessors, (155), 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 13:07:48,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 155 transitions. [2023-12-02 13:07:48,390 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 155 transitions. Word has length 125 [2023-12-02 13:07:48,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:07:48,390 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 155 transitions. [2023-12-02 13:07:48,390 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 123 states have internal predecessors, (135), 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 13:07:48,390 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 155 transitions. [2023-12-02 13:07:48,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2023-12-02 13:07:48,393 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:07:48,393 INFO L195 NwaCegarLoop]: trace histogram [99, 22, 22, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:07:48,398 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 13:07:48,593 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 13:07:48,594 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:07:48,594 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:07:48,594 INFO L85 PathProgramCache]: Analyzing trace with hash 1849634685, now seen corresponding path program 9 times [2023-12-02 13:07:48,594 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:07:48,594 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916480855] [2023-12-02 13:07:48,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:07:48,594 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:07:48,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:07:54,139 INFO L134 CoverageAnalysis]: Checked inductivity of 5456 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2023-12-02 13:07:54,139 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:07:54,139 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916480855] [2023-12-02 13:07:54,139 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [916480855] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:07:54,139 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874411978] [2023-12-02 13:07:54,139 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 13:07:54,139 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:07:54,140 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:07:54,140 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:07:54,141 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 13:07:54,494 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 13:07:54,494 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 13:07:54,501 INFO L262 TraceCheckSpWp]: Trace formula consists of 1241 conjuncts, 101 conjunts are in the unsatisfiable core [2023-12-02 13:07:54,508 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:07:54,644 INFO L134 CoverageAnalysis]: Checked inductivity of 5456 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2023-12-02 13:07:54,645 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:08:03,969 INFO L134 CoverageAnalysis]: Checked inductivity of 5456 backedges. 0 proven. 4950 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2023-12-02 13:08:03,969 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [874411978] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:08:03,969 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [180423501] [2023-12-02 13:08:03,971 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 13:08:03,971 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:08:03,971 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:08:03,971 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:08:03,972 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:08:04,107 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:08:04,444 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6161#(and (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#bb~0#1.base|) |ULTIMATE.start_main_~#bb~0#1.offset|)) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) 0) (<= 1 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 13:08:04,444 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:08:04,444 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:08:04,444 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 202 [2023-12-02 13:08:04,444 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716091559] [2023-12-02 13:08:04,445 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:08:04,445 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 203 states [2023-12-02 13:08:04,445 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:08:04,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 203 interpolants. [2023-12-02 13:08:04,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20520, Invalid=22536, Unknown=0, NotChecked=0, Total=43056 [2023-12-02 13:08:04,453 INFO L87 Difference]: Start difference. First operand 152 states and 155 transitions. Second operand has 203 states, 203 states have (on average 1.0394088669950738) internal successors, (211), 202 states have internal predecessors, (211), 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 13:08:04,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:08:04,907 INFO L93 Difference]: Finished difference Result 304 states and 410 transitions. [2023-12-02 13:08:04,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2023-12-02 13:08:04,908 INFO L78 Accepts]: Start accepts. Automaton has has 203 states, 203 states have (on average 1.0394088669950738) internal successors, (211), 202 states have internal predecessors, (211), 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 150 [2023-12-02 13:08:04,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:08:04,910 INFO L225 Difference]: With dead ends: 304 [2023-12-02 13:08:04,910 INFO L226 Difference]: Without dead ends: 253 [2023-12-02 13:08:04,912 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 549 GetRequests, 343 SyntacticMatches, 0 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1898 ImplicationChecksByTransitivity, 12.7s TimeCoverageRelationStatistics Valid=20520, Invalid=22536, Unknown=0, NotChecked=0, Total=43056 [2023-12-02 13:08:04,913 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 251 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 13:08:04,913 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 251 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 13:08:04,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2023-12-02 13:08:04,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 253. [2023-12-02 13:08:04,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.0158730158730158) internal successors, (256), 252 states have internal predecessors, (256), 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 13:08:04,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 256 transitions. [2023-12-02 13:08:04,937 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 256 transitions. Word has length 150 [2023-12-02 13:08:04,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:08:04,937 INFO L495 AbstractCegarLoop]: Abstraction has 253 states and 256 transitions. [2023-12-02 13:08:04,938 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 203 states, 203 states have (on average 1.0394088669950738) internal successors, (211), 202 states have internal predecessors, (211), 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 13:08:04,938 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 256 transitions. [2023-12-02 13:08:04,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2023-12-02 13:08:04,941 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:08:04,942 INFO L195 NwaCegarLoop]: trace histogram [200, 22, 22, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:08:04,948 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 13:08:05,142 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:08:05,142 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:08:05,143 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:08:05,143 INFO L85 PathProgramCache]: Analyzing trace with hash -1705820753, now seen corresponding path program 10 times [2023-12-02 13:08:05,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:08:05,143 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [171710814] [2023-12-02 13:08:05,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:08:05,143 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:08:05,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:08:26,136 INFO L134 CoverageAnalysis]: Checked inductivity of 20606 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2023-12-02 13:08:26,137 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:08:26,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [171710814] [2023-12-02 13:08:26,137 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [171710814] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:08:26,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [432832344] [2023-12-02 13:08:26,137 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 13:08:26,137 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:08:26,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:08:26,138 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:08:26,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 13:08:26,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:08:26,666 INFO L262 TraceCheckSpWp]: Trace formula consists of 2150 conjuncts, 202 conjunts are in the unsatisfiable core [2023-12-02 13:08:26,673 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:08:26,921 INFO L134 CoverageAnalysis]: Checked inductivity of 20606 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2023-12-02 13:08:26,921 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:09:04,392 INFO L134 CoverageAnalysis]: Checked inductivity of 20606 backedges. 0 proven. 20100 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2023-12-02 13:09:04,392 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [432832344] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:09:04,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [458995578] [2023-12-02 13:09:04,394 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 13:09:04,394 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:09:04,394 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:09:04,395 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:09:04,395 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:09:04,531 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:09:05,093 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9171#(and (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#bb~0#1.base|) |ULTIMATE.start_main_~#bb~0#1.offset|)) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) 0) (<= 1 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 13:09:05,093 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:09:05,093 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:09:05,094 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [202, 202, 202] total 404 [2023-12-02 13:09:05,094 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053577741] [2023-12-02 13:09:05,094 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:09:05,095 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 405 states [2023-12-02 13:09:05,095 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:09:05,108 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 405 interpolants. [2023-12-02 13:09:05,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81827, Invalid=85863, Unknown=0, NotChecked=0, Total=167690 [2023-12-02 13:09:05,117 INFO L87 Difference]: Start difference. First operand 253 states and 256 transitions. Second operand has 405 states, 405 states have (on average 1.019753086419753) internal successors, (413), 404 states have internal predecessors, (413), 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 13:09:08,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:09:08,174 INFO L93 Difference]: Finished difference Result 506 states and 713 transitions. [2023-12-02 13:09:08,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 404 states. [2023-12-02 13:09:08,175 INFO L78 Accepts]: Start accepts. Automaton has has 405 states, 405 states have (on average 1.019753086419753) internal successors, (413), 404 states have internal predecessors, (413), 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 251 [2023-12-02 13:09:08,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:09:08,177 INFO L225 Difference]: With dead ends: 506 [2023-12-02 13:09:08,177 INFO L226 Difference]: Without dead ends: 455 [2023-12-02 13:09:08,184 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 953 GetRequests, 545 SyntacticMatches, 0 SemanticMatches, 408 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3817 ImplicationChecksByTransitivity, 50.2s TimeCoverageRelationStatistics Valid=81827, Invalid=85863, Unknown=0, NotChecked=0, Total=167690 [2023-12-02 13:09:08,184 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 436 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 13:09:08,184 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 20 Invalid, 436 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 435 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 13:09:08,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2023-12-02 13:09:08,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 455. [2023-12-02 13:09:08,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 455 states, 454 states have (on average 1.0088105726872247) internal successors, (458), 454 states have internal predecessors, (458), 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 13:09:08,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 455 states to 455 states and 458 transitions. [2023-12-02 13:09:08,207 INFO L78 Accepts]: Start accepts. Automaton has 455 states and 458 transitions. Word has length 251 [2023-12-02 13:09:08,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:09:08,208 INFO L495 AbstractCegarLoop]: Abstraction has 455 states and 458 transitions. [2023-12-02 13:09:08,208 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 405 states, 405 states have (on average 1.019753086419753) internal successors, (413), 404 states have internal predecessors, (413), 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 13:09:08,208 INFO L276 IsEmpty]: Start isEmpty. Operand 455 states and 458 transitions. [2023-12-02 13:09:08,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 454 [2023-12-02 13:09:08,213 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:09:08,213 INFO L195 NwaCegarLoop]: trace histogram [402, 22, 22, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:09:08,222 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 13:09:08,414 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:09:08,414 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:09:08,414 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:09:08,414 INFO L85 PathProgramCache]: Analyzing trace with hash -102441361, now seen corresponding path program 11 times [2023-12-02 13:09:08,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:09:08,415 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382751920] [2023-12-02 13:09:08,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:09:08,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:09:09,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:10:36,145 INFO L134 CoverageAnalysis]: Checked inductivity of 81509 backedges. 0 proven. 81003 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2023-12-02 13:10:36,145 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:10:36,145 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382751920] [2023-12-02 13:10:36,145 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1382751920] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:10:36,145 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1973859067] [2023-12-02 13:10:36,145 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 13:10:36,145 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:10:36,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:10:36,147 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:10:36,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 13:10:45,713 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2023-12-02 13:10:45,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 13:10:45,727 INFO L262 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 13:10:45,735 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:10:49,028 INFO L134 CoverageAnalysis]: Checked inductivity of 81509 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 81256 trivial. 0 not checked. [2023-12-02 13:10:49,029 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:10:52,592 INFO L134 CoverageAnalysis]: Checked inductivity of 81509 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 81256 trivial. 0 not checked. [2023-12-02 13:10:52,592 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1973859067] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:10:52,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [165739985] [2023-12-02 13:10:52,594 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 13:10:52,594 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:10:52,595 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:10:52,595 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:10:52,595 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:10:52,759 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:10:53,836 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14247#(and (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#bb~0#1.base|) |ULTIMATE.start_main_~#bb~0#1.offset|)) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) 0) (<= 1 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 13:10:53,837 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:10:53,837 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:10:53,837 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [404, 25, 25] total 451 [2023-12-02 13:10:53,837 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679604257] [2023-12-02 13:10:53,837 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:10:53,838 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 451 states [2023-12-02 13:10:53,838 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:10:53,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 451 interpolants. [2023-12-02 13:10:53,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83000, Invalid=124480, Unknown=0, NotChecked=0, Total=207480 [2023-12-02 13:10:53,857 INFO L87 Difference]: Start difference. First operand 455 states and 458 transitions. Second operand has 451 states, 451 states have (on average 1.0266075388026608) internal successors, (463), 451 states have internal predecessors, (463), 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 13:12:04,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:12:04,686 INFO L93 Difference]: Finished difference Result 555 states and 609 transitions. [2023-12-02 13:12:04,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 451 states. [2023-12-02 13:12:04,687 INFO L78 Accepts]: Start accepts. Automaton has has 451 states, 451 states have (on average 1.0266075388026608) internal successors, (463), 451 states have internal predecessors, (463), 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 453 [2023-12-02 13:12:04,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:12:04,689 INFO L225 Difference]: With dead ends: 555 [2023-12-02 13:12:04,689 INFO L226 Difference]: Without dead ends: 504 [2023-12-02 13:12:04,719 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2164 GetRequests, 1307 SyntacticMatches, 0 SemanticMatches, 857 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102674 ImplicationChecksByTransitivity, 115.6s TimeCoverageRelationStatistics Valid=264753, Invalid=472269, Unknown=0, NotChecked=0, Total=737022 [2023-12-02 13:12:04,720 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 1215 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 537 mSolverCounterSat, 182 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1215 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 719 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 182 IncrementalHoareTripleChecker+Valid, 537 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 13:12:04,720 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1215 Valid, 40 Invalid, 719 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [182 Valid, 537 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 13:12:04,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2023-12-02 13:12:04,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 504. [2023-12-02 13:12:04,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 1.0079522862823063) internal successors, (507), 503 states have internal predecessors, (507), 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 13:12:04,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 507 transitions. [2023-12-02 13:12:04,746 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 507 transitions. Word has length 453 [2023-12-02 13:12:04,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:12:04,747 INFO L495 AbstractCegarLoop]: Abstraction has 504 states and 507 transitions. [2023-12-02 13:12:04,747 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 451 states, 451 states have (on average 1.0266075388026608) internal successors, (463), 451 states have internal predecessors, (463), 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 13:12:04,748 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 507 transitions. [2023-12-02 13:12:04,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 503 [2023-12-02 13:12:04,754 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:12:04,754 INFO L195 NwaCegarLoop]: trace histogram [403, 46, 46, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:12:04,767 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 13:12:04,955 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 13:12:04,955 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:12:04,955 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:12:04,956 INFO L85 PathProgramCache]: Analyzing trace with hash 331372285, now seen corresponding path program 12 times [2023-12-02 13:12:04,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:12:04,956 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614509187] [2023-12-02 13:12:04,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:12:04,956 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:12:05,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 13:13:38,332 INFO L134 CoverageAnalysis]: Checked inductivity of 83568 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 2162 trivial. 0 not checked. [2023-12-02 13:13:38,332 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 13:13:38,332 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614509187] [2023-12-02 13:13:38,332 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [614509187] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 13:13:38,332 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1845483958] [2023-12-02 13:13:38,333 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 13:13:38,333 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:13:38,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 13:13:38,334 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 13:13:38,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 13:13:39,427 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 13:13:39,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 13:13:39,455 INFO L262 TraceCheckSpWp]: Trace formula consists of 4289 conjuncts, 405 conjunts are in the unsatisfiable core [2023-12-02 13:13:39,469 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 13:13:39,951 INFO L134 CoverageAnalysis]: Checked inductivity of 83568 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 2162 trivial. 0 not checked. [2023-12-02 13:13:39,951 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 13:16:20,090 INFO L134 CoverageAnalysis]: Checked inductivity of 83568 backedges. 0 proven. 81406 refuted. 0 times theorem prover too weak. 2162 trivial. 0 not checked. [2023-12-02 13:16:20,091 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1845483958] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 13:16:20,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1993381578] [2023-12-02 13:16:20,093 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 13:16:20,093 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 13:16:20,093 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 13:16:20,093 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 13:16:20,093 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 13:16:20,215 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 13:16:21,339 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20979#(and (= |ULTIMATE.start_main_#t~mem8#1| (select (select |#memory_int| |ULTIMATE.start_main_~#bb~0#1.base|) |ULTIMATE.start_main_~#bb~0#1.offset|)) (<= 100000 |ULTIMATE.start_main_~a~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (+ |ULTIMATE.start_main_#t~mem8#1| 1) 0) (<= 1 |ULTIMATE.start_main_~b~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 13:16:21,339 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 13:16:21,339 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 13:16:21,340 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [405, 405, 405] total 810 [2023-12-02 13:16:21,340 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550786290] [2023-12-02 13:16:21,340 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 13:16:21,341 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 811 states [2023-12-02 13:16:21,341 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 13:16:21,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 811 interpolants. [2023-12-02 13:16:21,421 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=328472, Invalid=336568, Unknown=0, NotChecked=0, Total=665040 [2023-12-02 13:16:21,423 INFO L87 Difference]: Start difference. First operand 504 states and 507 transitions. Second operand has 811 states, 811 states have (on average 1.0098643649815042) internal successors, (819), 810 states have internal predecessors, (819), 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 13:16:39,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 13:16:39,761 INFO L93 Difference]: Finished difference Result 1008 states and 1418 transitions. [2023-12-02 13:16:39,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 810 states. [2023-12-02 13:16:39,762 INFO L78 Accepts]: Start accepts. Automaton has has 811 states, 811 states have (on average 1.0098643649815042) internal successors, (819), 810 states have internal predecessors, (819), 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 502 [2023-12-02 13:16:39,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 13:16:39,766 INFO L225 Difference]: With dead ends: 1008 [2023-12-02 13:16:39,766 INFO L226 Difference]: Without dead ends: 909 [2023-12-02 13:16:39,792 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1909 GetRequests, 1095 SyntacticMatches, 0 SemanticMatches, 814 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7674 ImplicationChecksByTransitivity, 211.3s TimeCoverageRelationStatistics Valid=328472, Invalid=336568, Unknown=0, NotChecked=0, Total=665040 [2023-12-02 13:16:39,793 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 870 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 871 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 870 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-12-02 13:16:39,793 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 40 Invalid, 871 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 870 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-12-02 13:16:39,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 909 states. [2023-12-02 13:16:39,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 909 to 909. [2023-12-02 13:16:39,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 909 states, 908 states have (on average 1.0044052863436124) internal successors, (912), 908 states have internal predecessors, (912), 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 13:16:39,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 909 states to 909 states and 912 transitions. [2023-12-02 13:16:39,838 INFO L78 Accepts]: Start accepts. Automaton has 909 states and 912 transitions. Word has length 502 [2023-12-02 13:16:39,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 13:16:39,839 INFO L495 AbstractCegarLoop]: Abstraction has 909 states and 912 transitions. [2023-12-02 13:16:39,840 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 811 states, 811 states have (on average 1.0098643649815042) internal successors, (819), 810 states have internal predecessors, (819), 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 13:16:39,840 INFO L276 IsEmpty]: Start isEmpty. Operand 909 states and 912 transitions. [2023-12-02 13:16:39,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 908 [2023-12-02 13:16:39,845 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 13:16:39,846 INFO L195 NwaCegarLoop]: trace histogram [808, 46, 46, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 13:16:39,858 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 13:16:40,046 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6d20bc92-838e-4464-84a8-7ac398ba538b/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 13:16:40,046 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 13:16:40,047 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 13:16:40,047 INFO L85 PathProgramCache]: Analyzing trace with hash -995354833, now seen corresponding path program 13 times [2023-12-02 13:16:40,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 13:16:40,047 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342610526] [2023-12-02 13:16:40,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 13:16:40,047 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 13:16:43,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat