./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/reducercommutativity/avg20-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/reducercommutativity/avg20-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX --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 61bc8e70ac867c6ac52806e5ae8f7e7cefd73775be941aab831dd9bf86f7dc88 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:13:44,772 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:13:44,877 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 00:13:44,887 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:13:44,888 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:13:44,930 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:13:44,931 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:13:44,932 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:13:44,933 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:13:44,938 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:13:44,938 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:13:44,940 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:13:44,940 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:13:44,942 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:13:44,942 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:13:44,943 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:13:44,943 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:13:44,943 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:13:44,944 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:13:44,945 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:13:44,945 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:13:44,945 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:13:44,947 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:13:44,947 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 00:13:44,947 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:13:44,948 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:13:44,948 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:13:44,949 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:13:44,949 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 00:13:44,949 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:13:44,951 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 00:13:44,951 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:13:44,951 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 00:13:44,951 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:13:44,951 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:13:44,952 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:13:44,952 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:13:44,952 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:13:44,952 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:13:44,953 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 00:13:44,953 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:13:44,953 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:13:44,953 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 00:13:44,953 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:13:44,954 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:13:44,954 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_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 61bc8e70ac867c6ac52806e5ae8f7e7cefd73775be941aab831dd9bf86f7dc88 [2023-11-12 00:13:45,315 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:13:45,341 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:13:45,344 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:13:45,345 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:13:45,346 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:13:45,348 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/reducercommutativity/avg20-2.i [2023-11-12 00:13:48,501 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:13:48,810 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:13:48,811 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/sv-benchmarks/c/reducercommutativity/avg20-2.i [2023-11-12 00:13:48,820 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/data/8e31ab28c/5961eb5416774972b7b889b76f2ddd71/FLAG4dc20bd8d [2023-11-12 00:13:48,840 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/data/8e31ab28c/5961eb5416774972b7b889b76f2ddd71 [2023-11-12 00:13:48,846 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:13:48,849 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:13:48,853 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:13:48,853 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:13:48,861 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:13:48,862 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:13:48" (1/1) ... [2023-11-12 00:13:48,863 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6cb15f1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:48, skipping insertion in model container [2023-11-12 00:13:48,864 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:13:48" (1/1) ... [2023-11-12 00:13:48,896 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:13:49,130 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_3be6e46a-8c4f-449b-97a3-6cd44000988c/sv-benchmarks/c/reducercommutativity/avg20-2.i[1282,1295] [2023-11-12 00:13:49,136 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:13:49,147 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:13:49,181 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_3be6e46a-8c4f-449b-97a3-6cd44000988c/sv-benchmarks/c/reducercommutativity/avg20-2.i[1282,1295] [2023-11-12 00:13:49,185 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:13:49,202 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:13:49,202 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:49 WrapperNode [2023-11-12 00:13:49,203 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:13:49,204 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:13:49,204 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:13:49,204 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:13:49,213 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:49" (1/1) ... [2023-11-12 00:13:49,231 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:49" (1/1) ... [2023-11-12 00:13:49,261 INFO L138 Inliner]: procedures = 16, calls = 22, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 69 [2023-11-12 00:13:49,261 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:13:49,262 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:13:49,262 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:13:49,262 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:13:49,273 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:49" (1/1) ... [2023-11-12 00:13:49,274 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:49" (1/1) ... [2023-11-12 00:13:49,279 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:49" (1/1) ... [2023-11-12 00:13:49,280 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:49" (1/1) ... [2023-11-12 00:13:49,298 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:49" (1/1) ... [2023-11-12 00:13:49,307 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:49" (1/1) ... [2023-11-12 00:13:49,309 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:49" (1/1) ... [2023-11-12 00:13:49,311 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:49" (1/1) ... [2023-11-12 00:13:49,316 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:13:49,317 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:13:49,318 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:13:49,318 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:13:49,319 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:49" (1/1) ... [2023-11-12 00:13:49,326 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:13:49,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:49,356 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:13:49,396 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:13:49,408 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:13:49,408 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:13:49,408 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 00:13:49,409 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 00:13:49,409 INFO L130 BoogieDeclarations]: Found specification of procedure avg [2023-11-12 00:13:49,409 INFO L138 BoogieDeclarations]: Found implementation of procedure avg [2023-11-12 00:13:49,409 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:13:49,409 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:13:49,410 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 00:13:49,410 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:13:49,491 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:13:49,493 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:13:49,727 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:13:49,771 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:13:49,771 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-12 00:13:49,774 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:13:49 BoogieIcfgContainer [2023-11-12 00:13:49,774 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:13:49,777 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:13:49,777 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:13:49,781 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:13:49,781 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:13:48" (1/3) ... [2023-11-12 00:13:49,782 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b69d2e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:13:49, skipping insertion in model container [2023-11-12 00:13:49,783 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:13:49" (2/3) ... [2023-11-12 00:13:49,783 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b69d2e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:13:49, skipping insertion in model container [2023-11-12 00:13:49,783 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:13:49" (3/3) ... [2023-11-12 00:13:49,785 INFO L112 eAbstractionObserver]: Analyzing ICFG avg20-2.i [2023-11-12 00:13:49,807 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:13:49,807 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 00:13:49,862 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:13:49,869 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;@10cbce0c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:13:49,869 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 00:13:49,875 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:13:49,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-12 00:13:49,884 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:49,884 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:49,885 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:13:49,891 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:49,891 INFO L85 PathProgramCache]: Analyzing trace with hash -1619445314, now seen corresponding path program 1 times [2023-11-12 00:13:49,903 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:49,903 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113635886] [2023-11-12 00:13:49,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:49,904 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:50,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:50,240 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-12 00:13:50,241 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:50,241 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113635886] [2023-11-12 00:13:50,242 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113635886] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:50,242 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:13:50,242 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:13:50,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991109867] [2023-11-12 00:13:50,247 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:50,251 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:13:50,252 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:50,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:13:50,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:13:50,295 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-12 00:13:50,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:50,342 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2023-11-12 00:13:50,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:13:50,345 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 20 [2023-11-12 00:13:50,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:50,352 INFO L225 Difference]: With dead ends: 33 [2023-11-12 00:13:50,352 INFO L226 Difference]: Without dead ends: 16 [2023-11-12 00:13:50,355 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:13:50,359 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:50,360 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:13:50,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-12 00:13:50,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-11-12 00:13:50,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:13:50,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2023-11-12 00:13:50,396 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 20 [2023-11-12 00:13:50,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:50,397 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2023-11-12 00:13:50,397 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-12 00:13:50,397 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2023-11-12 00:13:50,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-12 00:13:50,399 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:50,399 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:50,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:13:50,399 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:13:50,400 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:50,400 INFO L85 PathProgramCache]: Analyzing trace with hash -1931435292, now seen corresponding path program 1 times [2023-11-12 00:13:50,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:50,401 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1894481594] [2023-11-12 00:13:50,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:50,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:50,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:50,603 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-12 00:13:50,603 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:50,603 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1894481594] [2023-11-12 00:13:50,604 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1894481594] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:50,604 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1349946648] [2023-11-12 00:13:50,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:50,604 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:50,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:50,608 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:50,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:13:50,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:50,767 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 00:13:50,773 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:50,812 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-12 00:13:50,815 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:13:50,822 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1349946648] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:50,822 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:13:50,822 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2023-11-12 00:13:50,824 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288475544] [2023-11-12 00:13:50,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:50,827 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:13:50,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:50,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:13:50,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:13:50,831 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-12 00:13:50,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:50,864 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2023-11-12 00:13:50,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:13:50,865 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 21 [2023-11-12 00:13:50,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:50,866 INFO L225 Difference]: With dead ends: 29 [2023-11-12 00:13:50,866 INFO L226 Difference]: Without dead ends: 17 [2023-11-12 00:13:50,867 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:13:50,868 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:50,869 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:13:50,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-12 00:13:50,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-12 00:13:50,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:13:50,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-11-12 00:13:50,875 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 21 [2023-11-12 00:13:50,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:50,875 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-11-12 00:13:50,876 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-12 00:13:50,876 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-11-12 00:13:50,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-12 00:13:50,877 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:50,877 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:50,910 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 00:13:51,078 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:51,078 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:13:51,079 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:51,079 INFO L85 PathProgramCache]: Analyzing trace with hash -131351381, now seen corresponding path program 1 times [2023-11-12 00:13:51,079 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:51,080 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941901537] [2023-11-12 00:13:51,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:51,080 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:51,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:51,288 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-12 00:13:51,290 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:51,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941901537] [2023-11-12 00:13:51,292 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941901537] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:51,294 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1908446312] [2023-11-12 00:13:51,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:51,294 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:51,297 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:51,299 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:51,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:13:51,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:51,420 INFO L262 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 00:13:51,429 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:51,453 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-12 00:13:51,453 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:13:51,453 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1908446312] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:13:51,453 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:13:51,454 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2023-11-12 00:13:51,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81667636] [2023-11-12 00:13:51,454 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:13:51,454 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:13:51,455 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:51,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:13:51,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:13:51,457 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-12 00:13:51,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:51,488 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2023-11-12 00:13:51,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:13:51,489 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2023-11-12 00:13:51,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:51,491 INFO L225 Difference]: With dead ends: 27 [2023-11-12 00:13:51,491 INFO L226 Difference]: Without dead ends: 18 [2023-11-12 00:13:51,491 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:13:51,495 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:51,497 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:13:51,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-12 00:13:51,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-11-12 00:13:51,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:13:51,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2023-11-12 00:13:51,508 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 24 [2023-11-12 00:13:51,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:51,510 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2023-11-12 00:13:51,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-12 00:13:51,510 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2023-11-12 00:13:51,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-12 00:13:51,512 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:51,512 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:51,524 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-12 00:13:51,717 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:51,717 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:13:51,718 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:51,718 INFO L85 PathProgramCache]: Analyzing trace with hash -472030389, now seen corresponding path program 1 times [2023-11-12 00:13:51,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:51,718 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745576077] [2023-11-12 00:13:51,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:51,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:51,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:51,883 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-12 00:13:51,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:51,883 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745576077] [2023-11-12 00:13:51,884 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745576077] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:51,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1980114823] [2023-11-12 00:13:51,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:51,887 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:51,887 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:51,889 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:51,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:13:52,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:52,013 INFO L262 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:13:52,022 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:52,071 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-12 00:13:52,073 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:52,121 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-12 00:13:52,122 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1980114823] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:13:52,122 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [363584903] [2023-11-12 00:13:52,145 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:13:52,146 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:52,150 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:52,156 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:52,156 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:53,910 INFO L197 IcfgInterpreter]: Interpreting procedure avg with input of size 10 for LOIs [2023-11-12 00:13:54,062 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:13:54,665 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '522#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-12 00:13:54,665 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:13:54,665 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:13:54,665 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 4] total 7 [2023-11-12 00:13:54,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584552730] [2023-11-12 00:13:54,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:13:54,666 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:13:54,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:54,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:13:54,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=266, Unknown=9, NotChecked=0, Total=342 [2023-11-12 00:13:54,667 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-12 00:13:54,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:54,715 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2023-11-12 00:13:54,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:13:54,715 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 25 [2023-11-12 00:13:54,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:54,717 INFO L225 Difference]: With dead ends: 36 [2023-11-12 00:13:54,718 INFO L226 Difference]: Without dead ends: 21 [2023-11-12 00:13:54,719 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=67, Invalid=266, Unknown=9, NotChecked=0, Total=342 [2023-11-12 00:13:54,723 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:54,724 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 48 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:13:54,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-12 00:13:54,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-12 00:13:54,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:13:54,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2023-11-12 00:13:54,733 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 25 [2023-11-12 00:13:54,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:54,734 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2023-11-12 00:13:54,734 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-12 00:13:54,734 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2023-11-12 00:13:54,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-12 00:13:54,736 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:54,736 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:54,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:13:54,942 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:54,942 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:13:54,943 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:54,943 INFO L85 PathProgramCache]: Analyzing trace with hash 1085691557, now seen corresponding path program 2 times [2023-11-12 00:13:54,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:54,944 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1431873610] [2023-11-12 00:13:54,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:54,944 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:54,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:55,048 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-12 00:13:55,048 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:55,049 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1431873610] [2023-11-12 00:13:55,049 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1431873610] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:55,049 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2032679474] [2023-11-12 00:13:55,050 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:13:55,053 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:55,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:55,057 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:55,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:13:55,149 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 00:13:55,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:13:55,152 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:13:55,158 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:55,173 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-12 00:13:55,173 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:55,204 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-12 00:13:55,205 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2032679474] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:13:55,205 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2046268213] [2023-11-12 00:13:55,210 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:13:55,210 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:55,211 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:55,211 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:55,211 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:56,255 INFO L197 IcfgInterpreter]: Interpreting procedure avg with input of size 10 for LOIs [2023-11-12 00:13:56,359 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:13:56,910 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '794#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-12 00:13:56,910 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:13:56,910 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:13:56,911 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-12 00:13:56,911 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369450410] [2023-11-12 00:13:56,911 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:13:56,912 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:13:56,912 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:56,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:13:56,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=266, Unknown=9, NotChecked=0, Total=342 [2023-11-12 00:13:56,913 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-12 00:13:56,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:56,949 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2023-11-12 00:13:56,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:13:56,949 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 28 [2023-11-12 00:13:56,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:56,950 INFO L225 Difference]: With dead ends: 38 [2023-11-12 00:13:56,950 INFO L226 Difference]: Without dead ends: 24 [2023-11-12 00:13:56,951 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=67, Invalid=266, Unknown=9, NotChecked=0, Total=342 [2023-11-12 00:13:56,952 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 45 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 [2023-11-12 00:13:56,952 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:13:56,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-12 00:13:56,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-12 00:13:56,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:13:56,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2023-11-12 00:13:56,958 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 28 [2023-11-12 00:13:56,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:56,958 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2023-11-12 00:13:56,958 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-12 00:13:56,958 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2023-11-12 00:13:56,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-12 00:13:56,960 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:56,960 INFO L195 NwaCegarLoop]: trace histogram [12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:56,968 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:13:57,160 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:57,161 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:13:57,161 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:57,161 INFO L85 PathProgramCache]: Analyzing trace with hash -15425874, now seen corresponding path program 3 times [2023-11-12 00:13:57,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:57,161 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [525574268] [2023-11-12 00:13:57,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:57,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:57,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:57,297 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2023-11-12 00:13:57,297 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:57,297 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [525574268] [2023-11-12 00:13:57,298 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [525574268] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:57,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [710993560] [2023-11-12 00:13:57,299 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:13:57,299 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:57,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:57,301 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:57,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:13:57,420 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:13:57,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:13:57,422 INFO L262 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-12 00:13:57,429 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:13:57,473 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-11-12 00:13:57,474 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:13:57,551 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-11-12 00:13:57,551 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [710993560] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:13:57,551 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1420834514] [2023-11-12 00:13:57,555 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:13:57,555 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:13:57,556 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:13:57,556 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:13:57,556 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:13:58,453 INFO L197 IcfgInterpreter]: Interpreting procedure avg with input of size 10 for LOIs [2023-11-12 00:13:58,584 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:13:59,172 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1137#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-12 00:13:59,173 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:13:59,173 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:13:59,173 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 7] total 14 [2023-11-12 00:13:59,173 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88645114] [2023-11-12 00:13:59,173 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:13:59,174 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-12 00:13:59,174 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:13:59,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-12 00:13:59,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=524, Unknown=9, NotChecked=0, Total=650 [2023-11-12 00:13:59,175 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-12 00:13:59,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:13:59,230 INFO L93 Difference]: Finished difference Result 49 states and 63 transitions. [2023-11-12 00:13:59,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-12 00:13:59,231 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 37 [2023-11-12 00:13:59,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:13:59,231 INFO L225 Difference]: With dead ends: 49 [2023-11-12 00:13:59,231 INFO L226 Difference]: Without dead ends: 31 [2023-11-12 00:13:59,232 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=117, Invalid=524, Unknown=9, NotChecked=0, Total=650 [2023-11-12 00:13:59,233 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:13:59,233 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 70 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:13:59,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-11-12 00:13:59,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2023-11-12 00:13:59,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:13:59,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2023-11-12 00:13:59,239 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 37 [2023-11-12 00:13:59,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:13:59,240 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2023-11-12 00:13:59,240 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-12 00:13:59,240 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2023-11-12 00:13:59,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-11-12 00:13:59,241 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:13:59,242 INFO L195 NwaCegarLoop]: trace histogram [12, 10, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:13:59,257 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 00:13:59,458 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:59,458 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:13:59,458 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:13:59,458 INFO L85 PathProgramCache]: Analyzing trace with hash -572970562, now seen corresponding path program 4 times [2023-11-12 00:13:59,458 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:13:59,459 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008002541] [2023-11-12 00:13:59,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:13:59,459 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:13:59,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:13:59,876 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-11-12 00:13:59,876 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:13:59,877 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008002541] [2023-11-12 00:13:59,877 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1008002541] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:13:59,877 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1254461819] [2023-11-12 00:13:59,877 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:13:59,877 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:13:59,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:13:59,879 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:13:59,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:14:00,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:14:00,011 INFO L262 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-12 00:14:00,014 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:14:00,050 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-11-12 00:14:00,050 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:14:00,287 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-11-12 00:14:00,287 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1254461819] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:14:00,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1752447222] [2023-11-12 00:14:00,290 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:14:00,290 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:14:00,290 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:14:00,291 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:14:00,291 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:14:01,193 INFO L197 IcfgInterpreter]: Interpreting procedure avg with input of size 10 for LOIs [2023-11-12 00:14:01,287 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:14:01,862 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1567#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-12 00:14:01,862 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:14:01,862 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:14:01,862 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 23 [2023-11-12 00:14:01,862 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721182694] [2023-11-12 00:14:01,863 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:14:01,863 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-12 00:14:01,863 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:14:01,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-12 00:14:01,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=882, Unknown=9, NotChecked=0, Total=1190 [2023-11-12 00:14:01,865 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-12 00:14:01,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:14:01,949 INFO L93 Difference]: Finished difference Result 60 states and 77 transitions. [2023-11-12 00:14:01,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-12 00:14:01,950 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 44 [2023-11-12 00:14:01,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:14:01,951 INFO L225 Difference]: With dead ends: 60 [2023-11-12 00:14:01,951 INFO L226 Difference]: Without dead ends: 41 [2023-11-12 00:14:01,952 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=299, Invalid=882, Unknown=9, NotChecked=0, Total=1190 [2023-11-12 00:14:01,953 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:14:01,953 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 84 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:14:01,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-12 00:14:01,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-11-12 00:14:01,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:14:01,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2023-11-12 00:14:01,960 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 44 [2023-11-12 00:14:01,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:14:01,961 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2023-11-12 00:14:01,961 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-12 00:14:01,961 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2023-11-12 00:14:01,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-11-12 00:14:01,963 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:14:01,963 INFO L195 NwaCegarLoop]: trace histogram [20, 12, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:14:01,973 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 00:14:02,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:02,169 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:14:02,169 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:14:02,170 INFO L85 PathProgramCache]: Analyzing trace with hash -1338392194, now seen corresponding path program 5 times [2023-11-12 00:14:02,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:14:02,170 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2096412053] [2023-11-12 00:14:02,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:14:02,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:14:02,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:14:02,435 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2023-11-12 00:14:02,435 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:14:02,436 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2096412053] [2023-11-12 00:14:02,436 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2096412053] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:14:02,436 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1062919516] [2023-11-12 00:14:02,436 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:14:02,437 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:02,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:14:02,441 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:14:02,449 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 00:14:02,570 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-12 00:14:02,571 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:14:02,572 INFO L262 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-12 00:14:02,583 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:14:02,614 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 54 proven. 3 refuted. 0 times theorem prover too weak. 267 trivial. 0 not checked. [2023-11-12 00:14:02,614 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:14:02,657 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 321 trivial. 0 not checked. [2023-11-12 00:14:02,657 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1062919516] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:14:02,658 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1085173321] [2023-11-12 00:14:02,661 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:14:02,662 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:14:02,662 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:14:02,662 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:14:02,663 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:14:03,480 INFO L197 IcfgInterpreter]: Interpreting procedure avg with input of size 10 for LOIs [2023-11-12 00:14:03,587 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:14:04,158 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2089#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-12 00:14:04,158 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:14:04,158 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:14:04,158 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 13 [2023-11-12 00:14:04,158 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023147541] [2023-11-12 00:14:04,159 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:14:04,159 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-12 00:14:04,159 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:14:04,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-12 00:14:04,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=497, Unknown=9, NotChecked=0, Total=600 [2023-11-12 00:14:04,161 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-12 00:14:04,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:14:04,213 INFO L93 Difference]: Finished difference Result 64 states and 78 transitions. [2023-11-12 00:14:04,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-12 00:14:04,214 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 54 [2023-11-12 00:14:04,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:14:04,215 INFO L225 Difference]: With dead ends: 64 [2023-11-12 00:14:04,215 INFO L226 Difference]: Without dead ends: 46 [2023-11-12 00:14:04,216 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 182 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=94, Invalid=497, Unknown=9, NotChecked=0, Total=600 [2023-11-12 00:14:04,217 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:14:04,217 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:14:04,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-12 00:14:04,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-11-12 00:14:04,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 41 states have internal predecessors, (44), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:14:04,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2023-11-12 00:14:04,225 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 54 [2023-11-12 00:14:04,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:14:04,226 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2023-11-12 00:14:04,226 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-12 00:14:04,226 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2023-11-12 00:14:04,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-11-12 00:14:04,228 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:14:04,228 INFO L195 NwaCegarLoop]: trace histogram [20, 15, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:14:04,240 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-11-12 00:14:04,440 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:04,441 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:14:04,441 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:14:04,442 INFO L85 PathProgramCache]: Analyzing trace with hash 408059729, now seen corresponding path program 6 times [2023-11-12 00:14:04,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:14:04,442 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206866013] [2023-11-12 00:14:04,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:14:04,442 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:14:04,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:14:04,735 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 89 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2023-11-12 00:14:04,735 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:14:04,736 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206866013] [2023-11-12 00:14:04,736 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [206866013] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:14:04,736 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2136956628] [2023-11-12 00:14:04,736 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:14:04,737 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:04,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:14:04,738 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:14:04,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-12 00:14:04,937 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:14:04,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:14:04,941 INFO L262 TraceCheckSpWp]: Trace formula consists of 417 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-12 00:14:04,947 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:14:04,966 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 74 proven. 15 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2023-11-12 00:14:04,966 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:14:05,059 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 89 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2023-11-12 00:14:05,059 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2136956628] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:14:05,060 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1379702301] [2023-11-12 00:14:05,065 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:14:05,066 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:14:05,066 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:14:05,066 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:14:05,067 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:14:05,948 INFO L197 IcfgInterpreter]: Interpreting procedure avg with input of size 10 for LOIs [2023-11-12 00:14:06,047 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:14:06,611 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2673#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-12 00:14:06,611 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:14:06,611 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:14:06,611 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2023-11-12 00:14:06,612 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573651141] [2023-11-12 00:14:06,612 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:14:06,612 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-12 00:14:06,612 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:14:06,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-12 00:14:06,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=542, Unknown=9, NotChecked=0, Total=702 [2023-11-12 00:14:06,614 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-12 00:14:06,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:14:06,687 INFO L93 Difference]: Finished difference Result 76 states and 92 transitions. [2023-11-12 00:14:06,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-12 00:14:06,688 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) Word has length 61 [2023-11-12 00:14:06,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:14:06,689 INFO L225 Difference]: With dead ends: 76 [2023-11-12 00:14:06,689 INFO L226 Difference]: Without dead ends: 53 [2023-11-12 00:14:06,690 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 164 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 262 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=151, Invalid=542, Unknown=9, NotChecked=0, Total=702 [2023-11-12 00:14:06,691 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:14:06,692 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 67 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:14:06,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-11-12 00:14:06,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2023-11-12 00:14:06,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:14:06,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2023-11-12 00:14:06,705 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 61 [2023-11-12 00:14:06,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:14:06,705 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2023-11-12 00:14:06,706 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-12 00:14:06,706 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2023-11-12 00:14:06,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2023-11-12 00:14:06,709 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:14:06,710 INFO L195 NwaCegarLoop]: trace histogram [36, 20, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:14:06,726 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-12 00:14:06,917 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:06,917 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:14:06,917 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:14:06,917 INFO L85 PathProgramCache]: Analyzing trace with hash -278154754, now seen corresponding path program 7 times [2023-11-12 00:14:06,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:14:06,917 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359238907] [2023-11-12 00:14:06,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:14:06,918 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:14:06,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:14:07,433 INFO L134 CoverageAnalysis]: Checked inductivity of 978 backedges. 0 proven. 418 refuted. 0 times theorem prover too weak. 560 trivial. 0 not checked. [2023-11-12 00:14:07,434 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:14:07,434 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359238907] [2023-11-12 00:14:07,434 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [359238907] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:14:07,434 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1074619618] [2023-11-12 00:14:07,435 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:14:07,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:07,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:14:07,436 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:14:07,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-12 00:14:07,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:14:07,648 INFO L262 TraceCheckSpWp]: Trace formula consists of 522 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-12 00:14:07,651 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:14:07,690 INFO L134 CoverageAnalysis]: Checked inductivity of 978 backedges. 340 proven. 78 refuted. 0 times theorem prover too weak. 560 trivial. 0 not checked. [2023-11-12 00:14:07,690 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:14:07,922 INFO L134 CoverageAnalysis]: Checked inductivity of 978 backedges. 0 proven. 418 refuted. 0 times theorem prover too weak. 560 trivial. 0 not checked. [2023-11-12 00:14:07,923 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1074619618] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:14:07,923 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1025805506] [2023-11-12 00:14:07,925 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:14:07,925 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:14:07,926 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:14:07,926 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:14:07,926 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:14:08,628 INFO L197 IcfgInterpreter]: Interpreting procedure avg with input of size 10 for LOIs [2023-11-12 00:14:08,731 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:14:09,361 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3429#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-12 00:14:09,362 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:14:09,362 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:14:09,362 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2023-11-12 00:14:09,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374678175] [2023-11-12 00:14:09,362 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:14:09,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-12 00:14:09,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:14:09,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-12 00:14:09,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=882, Unknown=9, NotChecked=0, Total=1190 [2023-11-12 00:14:09,365 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 23 states have internal predecessors, (41), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-12 00:14:09,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:14:09,437 INFO L93 Difference]: Finished difference Result 91 states and 108 transitions. [2023-11-12 00:14:09,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-12 00:14:09,437 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 23 states have internal predecessors, (41), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) Word has length 82 [2023-11-12 00:14:09,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:14:09,439 INFO L225 Difference]: With dead ends: 91 [2023-11-12 00:14:09,439 INFO L226 Difference]: Without dead ends: 61 [2023-11-12 00:14:09,440 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 220 SyntacticMatches, 6 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 455 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=299, Invalid=882, Unknown=9, NotChecked=0, Total=1190 [2023-11-12 00:14:09,441 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:14:09,441 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:14:09,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-11-12 00:14:09,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2023-11-12 00:14:09,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:14:09,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 65 transitions. [2023-11-12 00:14:09,449 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 65 transitions. Word has length 82 [2023-11-12 00:14:09,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:14:09,450 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 65 transitions. [2023-11-12 00:14:09,450 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 23 states have internal predecessors, (41), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-12 00:14:09,450 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 65 transitions. [2023-11-12 00:14:09,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2023-11-12 00:14:09,452 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:14:09,452 INFO L195 NwaCegarLoop]: trace histogram [60, 20, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:14:09,459 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-11-12 00:14:09,659 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:09,659 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:14:09,659 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:14:09,660 INFO L85 PathProgramCache]: Analyzing trace with hash 462509694, now seen corresponding path program 8 times [2023-11-12 00:14:09,660 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:14:09,660 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1904673594] [2023-11-12 00:14:09,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:14:09,660 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:14:09,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:14:10,041 INFO L134 CoverageAnalysis]: Checked inductivity of 2190 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2023-11-12 00:14:10,041 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:14:10,041 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1904673594] [2023-11-12 00:14:10,041 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1904673594] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:14:10,041 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1652526395] [2023-11-12 00:14:10,042 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:14:10,042 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:10,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:14:10,043 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:14:10,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-12 00:14:10,346 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-11-12 00:14:10,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:14:10,349 INFO L262 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-12 00:14:10,352 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:14:10,380 INFO L134 CoverageAnalysis]: Checked inductivity of 2190 backedges. 886 proven. 21 refuted. 0 times theorem prover too weak. 1283 trivial. 0 not checked. [2023-11-12 00:14:10,380 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:14:10,526 INFO L134 CoverageAnalysis]: Checked inductivity of 2190 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2023-11-12 00:14:10,527 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1652526395] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:14:10,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [659102223] [2023-11-12 00:14:10,529 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:14:10,530 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:14:10,530 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:14:10,530 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:14:10,530 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:14:11,240 INFO L197 IcfgInterpreter]: Interpreting procedure avg with input of size 10 for LOIs [2023-11-12 00:14:11,298 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:14:11,837 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4369#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-12 00:14:11,837 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:14:11,837 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:14:11,838 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2023-11-12 00:14:11,838 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923147216] [2023-11-12 00:14:11,838 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:14:11,839 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-12 00:14:11,839 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:14:11,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-12 00:14:11,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=621, Unknown=9, NotChecked=0, Total=812 [2023-11-12 00:14:11,840 INFO L87 Difference]: Start difference. First operand 61 states and 65 transitions. Second operand has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-12 00:14:11,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:14:11,917 INFO L93 Difference]: Finished difference Result 97 states and 109 transitions. [2023-11-12 00:14:11,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-12 00:14:11,917 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 106 [2023-11-12 00:14:11,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:14:11,918 INFO L225 Difference]: With dead ends: 97 [2023-11-12 00:14:11,919 INFO L226 Difference]: Without dead ends: 69 [2023-11-12 00:14:11,919 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 298 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=182, Invalid=621, Unknown=9, NotChecked=0, Total=812 [2023-11-12 00:14:11,920 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:14:11,920 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 67 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:14:11,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-11-12 00:14:11,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2023-11-12 00:14:11,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:14:11,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 73 transitions. [2023-11-12 00:14:11,929 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 73 transitions. Word has length 106 [2023-11-12 00:14:11,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:14:11,929 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 73 transitions. [2023-11-12 00:14:11,929 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-12 00:14:11,930 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 73 transitions. [2023-11-12 00:14:11,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-11-12 00:14:11,931 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:14:11,931 INFO L195 NwaCegarLoop]: trace histogram [60, 20, 14, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:14:11,950 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-12 00:14:12,134 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:12,135 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:14:12,135 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:14:12,135 INFO L85 PathProgramCache]: Analyzing trace with hash -1962873218, now seen corresponding path program 9 times [2023-11-12 00:14:12,135 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:14:12,135 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999418510] [2023-11-12 00:14:12,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:14:12,135 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:14:12,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:14:12,839 INFO L134 CoverageAnalysis]: Checked inductivity of 2274 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2023-11-12 00:14:12,839 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:14:12,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [999418510] [2023-11-12 00:14:12,839 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [999418510] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:14:12,839 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1022960182] [2023-11-12 00:14:12,839 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:14:12,839 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:12,840 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:14:12,841 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:14:12,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-12 00:14:13,091 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:14:13,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:14:13,095 INFO L262 TraceCheckSpWp]: Trace formula consists of 698 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-12 00:14:13,099 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:14:13,132 INFO L134 CoverageAnalysis]: Checked inductivity of 2274 backedges. 886 proven. 105 refuted. 0 times theorem prover too weak. 1283 trivial. 0 not checked. [2023-11-12 00:14:13,133 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:14:13,356 INFO L134 CoverageAnalysis]: Checked inductivity of 2274 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 2169 trivial. 0 not checked. [2023-11-12 00:14:13,357 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1022960182] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:14:13,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1239448262] [2023-11-12 00:14:13,359 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-12 00:14:13,359 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:14:13,360 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:14:13,360 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:14:13,360 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:14:14,051 INFO L197 IcfgInterpreter]: Interpreting procedure avg with input of size 10 for LOIs [2023-11-12 00:14:14,128 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:14:14,749 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5392#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-12 00:14:14,749 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:14:14,749 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:14:14,749 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 22 [2023-11-12 00:14:14,750 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639706431] [2023-11-12 00:14:14,750 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:14:14,750 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-12 00:14:14,750 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:14:14,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-12 00:14:14,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=836, Unknown=9, NotChecked=0, Total=1122 [2023-11-12 00:14:14,752 INFO L87 Difference]: Start difference. First operand 69 states and 73 transitions. Second operand has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-12 00:14:14,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:14:14,829 INFO L93 Difference]: Finished difference Result 102 states and 111 transitions. [2023-11-12 00:14:14,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-11-12 00:14:14,830 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 114 [2023-11-12 00:14:14,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:14:14,831 INFO L225 Difference]: With dead ends: 102 [2023-11-12 00:14:14,832 INFO L226 Difference]: Without dead ends: 74 [2023-11-12 00:14:14,832 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 314 SyntacticMatches, 11 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=277, Invalid=836, Unknown=9, NotChecked=0, Total=1122 [2023-11-12 00:14:14,833 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:14:14,834 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 78 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:14:14,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2023-11-12 00:14:14,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2023-11-12 00:14:14,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 69 states have (on average 1.0434782608695652) internal successors, (72), 69 states have internal predecessors, (72), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:14:14,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 78 transitions. [2023-11-12 00:14:14,842 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 78 transitions. Word has length 114 [2023-11-12 00:14:14,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:14:14,843 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 78 transitions. [2023-11-12 00:14:14,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 states have internal predecessors, (37), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-12 00:14:14,843 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 78 transitions. [2023-11-12 00:14:14,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2023-11-12 00:14:14,845 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:14:14,845 INFO L195 NwaCegarLoop]: trace histogram [60, 20, 19, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:14:14,857 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-12 00:14:15,057 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3be6e46a-8c4f-449b-97a3-6cd44000988c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:14:15,057 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:14:15,057 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:14:15,058 INFO L85 PathProgramCache]: Analyzing trace with hash 1334223790, now seen corresponding path program 10 times [2023-11-12 00:14:15,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:14:15,058 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099208955] [2023-11-12 00:14:15,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:14:15,058 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:14:23,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat