./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-fpi/eqn4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-fpi/eqn4.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ --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 7bfa83e4265de8b9a1bd21dc33b28b63f68994b9952943e0726905cc1e10334a --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:15:17,450 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:15:17,573 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:15:17,583 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:15:17,584 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:15:17,620 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:15:17,621 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:15:17,622 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:15:17,623 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:15:17,624 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:15:17,624 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:15:17,625 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:15:17,626 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:15:17,626 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:15:17,627 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:15:17,627 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:15:17,628 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:15:17,629 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:15:17,629 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:15:17,630 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:15:17,631 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:15:17,632 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:15:17,632 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:15:17,633 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:15:17,634 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:15:17,634 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:15:17,635 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:15:17,636 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:15:17,636 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:15:17,637 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:15:17,637 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:15:17,638 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:15:17,638 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:15:17,639 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:15:17,640 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:15:17,640 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:15:17,641 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:15:17,641 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:15:17,642 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:15:17,642 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:15:17,643 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:15:17,643 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:15:17,644 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:15:17,644 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:15:17,644 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:15:17,644 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_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7bfa83e4265de8b9a1bd21dc33b28b63f68994b9952943e0726905cc1e10334a [2023-11-19 05:15:17,967 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:15:18,020 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:15:18,022 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:15:18,024 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:15:18,024 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:15:18,026 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/array-fpi/eqn4.c [2023-11-19 05:15:21,359 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:15:21,601 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:15:21,601 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/sv-benchmarks/c/array-fpi/eqn4.c [2023-11-19 05:15:21,608 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/data/317e0313a/1972cb3a6ce3459292872dbf78c1a5e2/FLAGe0644d547 [2023-11-19 05:15:21,620 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/data/317e0313a/1972cb3a6ce3459292872dbf78c1a5e2 [2023-11-19 05:15:21,622 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:15:21,624 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:15:21,625 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:15:21,626 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:15:21,631 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:15:21,632 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:15:21" (1/1) ... [2023-11-19 05:15:21,633 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@103468bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:15:21, skipping insertion in model container [2023-11-19 05:15:21,633 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:15:21" (1/1) ... [2023-11-19 05:15:21,654 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:15:21,808 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_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/sv-benchmarks/c/array-fpi/eqn4.c[587,600] [2023-11-19 05:15:21,838 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:15:21,849 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:15:21,865 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_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/sv-benchmarks/c/array-fpi/eqn4.c[587,600] [2023-11-19 05:15:21,873 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:15:21,889 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:15:21,889 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:15:21 WrapperNode [2023-11-19 05:15:21,890 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:15:21,891 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:15:21,891 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:15:21,891 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:15:21,899 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:15:21" (1/1) ... [2023-11-19 05:15:21,907 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:15:21" (1/1) ... [2023-11-19 05:15:21,945 INFO L138 Inliner]: procedures = 16, calls = 26, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 79 [2023-11-19 05:15:21,945 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:15:21,946 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:15:21,946 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:15:21,946 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:15:21,956 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:15:21" (1/1) ... [2023-11-19 05:15:21,957 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:15:21" (1/1) ... [2023-11-19 05:15:21,959 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:15:21" (1/1) ... [2023-11-19 05:15:21,959 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:15:21" (1/1) ... [2023-11-19 05:15:21,965 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:15:21" (1/1) ... [2023-11-19 05:15:21,969 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:15:21" (1/1) ... [2023-11-19 05:15:21,971 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:15:21" (1/1) ... [2023-11-19 05:15:21,972 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:15:21" (1/1) ... [2023-11-19 05:15:21,974 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:15:21,975 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:15:21,975 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:15:21,976 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:15:21,977 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:15:21" (1/1) ... [2023-11-19 05:15:21,988 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:15:22,018 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:22,029 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:15:22,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:15:22,065 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:15:22,065 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:15:22,065 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 05:15:22,066 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 05:15:22,066 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:15:22,066 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:15:22,068 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 05:15:22,132 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:15:22,134 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:15:22,322 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:15:22,390 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:15:22,390 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-19 05:15:22,416 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:15:22 BoogieIcfgContainer [2023-11-19 05:15:22,419 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:15:22,422 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:15:22,424 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:15:22,428 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:15:22,429 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:15:21" (1/3) ... [2023-11-19 05:15:22,431 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c8b8a48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:15:22, skipping insertion in model container [2023-11-19 05:15:22,431 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:15:21" (2/3) ... [2023-11-19 05:15:22,432 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c8b8a48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:15:22, skipping insertion in model container [2023-11-19 05:15:22,434 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:15:22" (3/3) ... [2023-11-19 05:15:22,436 INFO L112 eAbstractionObserver]: Analyzing ICFG eqn4.c [2023-11-19 05:15:22,462 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:15:22,463 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:15:22,521 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:15:22,529 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;@489c9ae7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:15:22,530 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:15:22,533 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:22,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-19 05:15:22,540 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:22,541 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:22,541 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:22,546 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:22,547 INFO L85 PathProgramCache]: Analyzing trace with hash -794748304, now seen corresponding path program 1 times [2023-11-19 05:15:22,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:22,558 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [769377728] [2023-11-19 05:15:22,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:22,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:22,787 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:15:22,788 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [827311837] [2023-11-19 05:15:22,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:22,789 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:22,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:22,792 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:22,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:15:22,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:22,948 INFO L262 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-19 05:15:22,956 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:23,146 INFO L349 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2023-11-19 05:15:23,147 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 64 [2023-11-19 05:15:23,171 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-11-19 05:15:23,252 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-11-19 05:15:23,304 WARN L214 Elim1Store]: Array PQE input equivalent to false [2023-11-19 05:15:23,328 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-19 05:15:23,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:15:23,403 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:15:23,403 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:23,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [769377728] [2023-11-19 05:15:23,404 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:15:23,405 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [827311837] [2023-11-19 05:15:23,405 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [827311837] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:15:23,406 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:15:23,407 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 05:15:23,410 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109042689] [2023-11-19 05:15:23,411 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:15:23,416 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:15:23,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:23,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:15:23,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:15:23,468 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:23,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:23,628 INFO L93 Difference]: Finished difference Result 30 states and 41 transitions. [2023-11-19 05:15:23,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:15:23,630 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-19 05:15:23,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:23,639 INFO L225 Difference]: With dead ends: 30 [2023-11-19 05:15:23,640 INFO L226 Difference]: Without dead ends: 19 [2023-11-19 05:15:23,643 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:15:23,652 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 11 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:23,658 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 19 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:15:23,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-19 05:15:23,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 13. [2023-11-19 05:15:23,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:23,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 17 transitions. [2023-11-19 05:15:23,699 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 17 transitions. Word has length 7 [2023-11-19 05:15:23,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:23,700 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 17 transitions. [2023-11-19 05:15:23,700 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 5 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:23,700 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 17 transitions. [2023-11-19 05:15:23,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-19 05:15:23,701 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:23,701 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:23,730 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-19 05:15:23,917 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:23,917 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:23,918 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:23,918 INFO L85 PathProgramCache]: Analyzing trace with hash 1127926275, now seen corresponding path program 1 times [2023-11-19 05:15:23,919 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:23,919 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [173748449] [2023-11-19 05:15:23,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:23,919 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:23,965 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:15:23,965 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1837403379] [2023-11-19 05:15:23,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:23,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:23,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:23,967 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:23,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:15:24,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:24,087 INFO L262 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-19 05:15:24,088 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:24,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:15:24,151 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:15:24,152 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:24,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [173748449] [2023-11-19 05:15:24,154 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:15:24,154 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1837403379] [2023-11-19 05:15:24,155 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1837403379] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:15:24,155 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:15:24,156 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-19 05:15:24,156 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673807354] [2023-11-19 05:15:24,156 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:15:24,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:15:24,158 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:24,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:15:24,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-19 05:15:24,159 INFO L87 Difference]: Start difference. First operand 13 states and 17 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:24,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:24,237 INFO L93 Difference]: Finished difference Result 25 states and 31 transitions. [2023-11-19 05:15:24,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:15:24,241 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-19 05:15:24,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:24,242 INFO L225 Difference]: With dead ends: 25 [2023-11-19 05:15:24,242 INFO L226 Difference]: Without dead ends: 19 [2023-11-19 05:15:24,243 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:15:24,244 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:24,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 9 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:15:24,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-19 05:15:24,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 13. [2023-11-19 05:15:24,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:24,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2023-11-19 05:15:24,253 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 8 [2023-11-19 05:15:24,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:24,253 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2023-11-19 05:15:24,253 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:24,254 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2023-11-19 05:15:24,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-19 05:15:24,254 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:24,254 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:24,273 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-19 05:15:24,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:24,464 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:24,465 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:24,465 INFO L85 PathProgramCache]: Analyzing trace with hash 849022933, now seen corresponding path program 1 times [2023-11-19 05:15:24,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:24,466 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1790016564] [2023-11-19 05:15:24,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:24,466 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:24,518 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:15:24,521 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [312406476] [2023-11-19 05:15:24,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:24,521 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:24,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:24,523 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:24,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:15:24,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:24,599 INFO L262 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-19 05:15:24,600 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:24,631 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:15:24,631 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:15:24,659 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:15:24,659 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:24,659 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1790016564] [2023-11-19 05:15:24,660 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:15:24,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [312406476] [2023-11-19 05:15:24,660 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [312406476] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:15:24,660 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1953627363] [2023-11-19 05:15:24,694 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 05:15:24,694 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:15:24,700 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:15:24,707 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:15:24,707 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:15:27,983 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:15:28,950 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '225#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (= ~N~0 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~b~0#1.base|) 0) |ULTIMATE.start_main_#t~mem13#1|) (not (= |ULTIMATE.start_main_#t~mem13#1| 1)) (= |ULTIMATE.start_main_~b~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 05:15:28,951 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:15:28,951 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:15:28,951 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2023-11-19 05:15:28,951 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822991067] [2023-11-19 05:15:28,951 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:15:28,952 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:15:28,952 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:28,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:15:28,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2023-11-19 05:15:28,953 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:29,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:29,349 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2023-11-19 05:15:29,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 05:15:29,349 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-19 05:15:29,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:29,350 INFO L225 Difference]: With dead ends: 29 [2023-11-19 05:15:29,350 INFO L226 Difference]: Without dead ends: 24 [2023-11-19 05:15:29,351 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2023-11-19 05:15:29,352 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 20 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:29,353 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 15 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:15:29,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-19 05:15:29,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 14. [2023-11-19 05:15:29,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:29,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2023-11-19 05:15:29,359 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 8 [2023-11-19 05:15:29,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:29,360 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2023-11-19 05:15:29,360 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:29,360 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2023-11-19 05:15:29,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-19 05:15:29,361 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:29,361 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:29,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:29,582 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:29,583 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:29,583 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:29,583 INFO L85 PathProgramCache]: Analyzing trace with hash 545227070, now seen corresponding path program 1 times [2023-11-19 05:15:29,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:29,584 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718324108] [2023-11-19 05:15:29,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:29,584 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:29,625 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:15:29,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1594672707] [2023-11-19 05:15:29,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:29,636 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:29,636 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:29,637 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:29,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:15:29,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:29,736 INFO L262 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-19 05:15:29,740 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:29,904 INFO L349 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2023-11-19 05:15:29,905 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 64 [2023-11-19 05:15:29,934 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-11-19 05:15:30,006 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-11-19 05:15:30,151 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-19 05:15:30,152 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 5 [2023-11-19 05:15:30,178 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-19 05:15:30,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:15:30,295 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 14 [2023-11-19 05:15:30,509 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 27 [2023-11-19 05:15:30,853 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:15:30,853 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:15:31,729 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:15:31,730 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:31,730 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718324108] [2023-11-19 05:15:31,730 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:15:31,730 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1594672707] [2023-11-19 05:15:31,731 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1594672707] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:15:31,731 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [259993665] [2023-11-19 05:15:31,734 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 05:15:31,734 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:15:31,735 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:15:31,735 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:15:31,735 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:15:35,482 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:15:37,110 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '357#(and (= |ULTIMATE.start_main_~i~0#1| 0) (<= 1 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem13#1| (select (select |#memory_int| |ULTIMATE.start_main_~b~0#1.base|) |ULTIMATE.start_main_~b~0#1.offset|)) (not (= |ULTIMATE.start_main_#t~mem13#1| 1)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 05:15:37,111 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:15:37,111 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:15:37,111 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 12 [2023-11-19 05:15:37,111 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474580013] [2023-11-19 05:15:37,111 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:15:37,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-19 05:15:37,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:37,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-19 05:15:37,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=249, Unknown=3, NotChecked=0, Total=306 [2023-11-19 05:15:37,113 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 12 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:39,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:39,714 INFO L93 Difference]: Finished difference Result 43 states and 49 transitions. [2023-11-19 05:15:39,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-19 05:15:39,715 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-19 05:15:39,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:39,716 INFO L225 Difference]: With dead ends: 43 [2023-11-19 05:15:39,716 INFO L226 Difference]: Without dead ends: 41 [2023-11-19 05:15:39,717 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=135, Invalid=512, Unknown=3, NotChecked=0, Total=650 [2023-11-19 05:15:39,718 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 57 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:39,719 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 28 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-19 05:15:39,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-19 05:15:39,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 16. [2023-11-19 05:15:39,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.4) internal successors, (21), 15 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:39,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 21 transitions. [2023-11-19 05:15:39,730 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 21 transitions. Word has length 9 [2023-11-19 05:15:39,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:39,730 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 21 transitions. [2023-11-19 05:15:39,731 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:39,731 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 21 transitions. [2023-11-19 05:15:39,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-19 05:15:39,732 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:39,732 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:39,762 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:39,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:39,945 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:39,946 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:39,946 INFO L85 PathProgramCache]: Analyzing trace with hash 1813092602, now seen corresponding path program 1 times [2023-11-19 05:15:39,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:39,946 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2007576134] [2023-11-19 05:15:39,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:39,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:39,977 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:15:39,978 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1421515036] [2023-11-19 05:15:39,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:39,978 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:39,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:39,979 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:40,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:15:40,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:40,059 INFO L262 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 05:15:40,061 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:40,392 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:15:40,392 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:15:40,392 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:40,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2007576134] [2023-11-19 05:15:40,392 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:15:40,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1421515036] [2023-11-19 05:15:40,393 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1421515036] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:15:40,393 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:15:40,393 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-19 05:15:40,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368876274] [2023-11-19 05:15:40,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:15:40,394 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:15:40,394 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:40,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:15:40,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:15:40,395 INFO L87 Difference]: Start difference. First operand 16 states and 21 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:40,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:40,667 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2023-11-19 05:15:40,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:15:40,668 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-19 05:15:40,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:40,669 INFO L225 Difference]: With dead ends: 30 [2023-11-19 05:15:40,669 INFO L226 Difference]: Without dead ends: 20 [2023-11-19 05:15:40,669 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:15:40,671 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 6 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:40,671 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 12 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:15:40,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-19 05:15:40,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 15. [2023-11-19 05:15:40,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:40,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2023-11-19 05:15:40,681 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 10 [2023-11-19 05:15:40,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:40,682 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2023-11-19 05:15:40,682 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:40,682 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2023-11-19 05:15:40,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-19 05:15:40,683 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:40,683 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:40,709 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:40,897 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:40,897 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:40,898 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:40,898 INFO L85 PathProgramCache]: Analyzing trace with hash -172558306, now seen corresponding path program 2 times [2023-11-19 05:15:40,898 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:40,898 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1274152943] [2023-11-19 05:15:40,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:40,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:40,963 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:15:40,963 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1276128002] [2023-11-19 05:15:40,964 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:15:40,964 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:40,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:40,965 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:40,997 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:15:41,115 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-19 05:15:41,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:15:41,117 INFO L262 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 05:15:41,118 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:41,455 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:15:41,455 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:15:41,776 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:15:41,777 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:41,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1274152943] [2023-11-19 05:15:41,777 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:15:41,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1276128002] [2023-11-19 05:15:41,777 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1276128002] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:15:41,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [742713649] [2023-11-19 05:15:41,780 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 05:15:41,781 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:15:41,781 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:15:41,781 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:15:41,781 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:15:45,610 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:15:46,872 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '637#(and (= |ULTIMATE.start_main_~i~0#1| 0) (<= 1 ~N~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem13#1| (select (select |#memory_int| |ULTIMATE.start_main_~b~0#1.base|) |ULTIMATE.start_main_~b~0#1.offset|)) (not (= |ULTIMATE.start_main_#t~mem13#1| 1)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-19 05:15:46,872 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:15:46,873 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:15:46,873 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2023-11-19 05:15:46,873 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057994628] [2023-11-19 05:15:46,873 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:15:46,873 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-19 05:15:46,874 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:46,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-19 05:15:46,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2023-11-19 05:15:46,875 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:47,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:47,822 INFO L93 Difference]: Finished difference Result 55 states and 66 transitions. [2023-11-19 05:15:47,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:15:47,823 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-19 05:15:47,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:47,824 INFO L225 Difference]: With dead ends: 55 [2023-11-19 05:15:47,825 INFO L226 Difference]: Without dead ends: 44 [2023-11-19 05:15:47,825 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2023-11-19 05:15:47,827 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 36 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:47,827 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 34 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-19 05:15:47,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-19 05:15:47,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 27. [2023-11-19 05:15:47,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 26 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:47,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 34 transitions. [2023-11-19 05:15:47,843 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 34 transitions. Word has length 11 [2023-11-19 05:15:47,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:47,844 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 34 transitions. [2023-11-19 05:15:47,844 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:47,844 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 34 transitions. [2023-11-19 05:15:47,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-19 05:15:47,845 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:47,846 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:47,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:48,053 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-19 05:15:48,054 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:48,054 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:48,054 INFO L85 PathProgramCache]: Analyzing trace with hash -701556884, now seen corresponding path program 1 times [2023-11-19 05:15:48,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:48,055 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942586426] [2023-11-19 05:15:48,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:48,055 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:48,109 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:15:48,110 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1957206690] [2023-11-19 05:15:48,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:48,110 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:48,110 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:48,118 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:48,137 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 05:15:48,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:48,231 INFO L262 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-19 05:15:48,235 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:48,389 INFO L349 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2023-11-19 05:15:48,390 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 19 [2023-11-19 05:15:48,474 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-19 05:15:48,618 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-11-19 05:15:48,619 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 21 [2023-11-19 05:15:48,826 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-11-19 05:15:48,826 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 28 [2023-11-19 05:15:49,588 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:15:49,589 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:15:51,154 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse0 (mod |c_ULTIMATE.start_main_~i~0#1| 4294967296))) (let ((.cse1 (select |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base|)) (.cse3 (* .cse0 8))) (and (or (< 2147483647 .cse0) (forall ((v_ArrVal_165 (Array Int Int))) (or (not (= v_ArrVal_165 (let ((.cse2 (+ .cse3 |c_ULTIMATE.start_main_~a~0#1.offset|))) (store .cse1 .cse2 (select v_ArrVal_165 .cse2))))) (= (+ (select v_ArrVal_165 |c_ULTIMATE.start_main_~a~0#1.offset|) (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_ArrVal_165) |c_ULTIMATE.start_main_~b~0#1.base|) |c_ULTIMATE.start_main_~b~0#1.offset|)) 9)))) (or (forall ((v_ArrVal_165 (Array Int Int))) (or (not (= v_ArrVal_165 (let ((.cse4 (+ .cse3 |c_ULTIMATE.start_main_~a~0#1.offset| (- 34359738368)))) (store .cse1 .cse4 (select v_ArrVal_165 .cse4))))) (= (+ (select v_ArrVal_165 |c_ULTIMATE.start_main_~a~0#1.offset|) (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_ArrVal_165) |c_ULTIMATE.start_main_~b~0#1.base|) |c_ULTIMATE.start_main_~b~0#1.offset|)) 9))) (< .cse0 2147483648))))) is different from false [2023-11-19 05:15:51,176 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 1 not checked. [2023-11-19 05:15:51,177 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:51,177 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942586426] [2023-11-19 05:15:51,177 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:15:51,177 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1957206690] [2023-11-19 05:15:51,177 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1957206690] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:15:51,178 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [92086228] [2023-11-19 05:15:51,180 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:15:51,180 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:15:51,180 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:15:51,181 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:15:51,181 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:15:51,853 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:15:53,938 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '857#(and (or (and (<= (mod |ULTIMATE.start_main_~i~0#1| 4294967296) 2147483647) (= (select (select |#memory_int| |ULTIMATE.start_main_~b~0#1.base|) (+ |ULTIMATE.start_main_~b~0#1.offset| (* (mod |ULTIMATE.start_main_~i~0#1| 4294967296) 8))) |ULTIMATE.start_main_#t~mem13#1|)) (and (<= 2147483648 (mod |ULTIMATE.start_main_~i~0#1| 4294967296)) (= (select (select |#memory_int| |ULTIMATE.start_main_~b~0#1.base|) (+ |ULTIMATE.start_main_~b~0#1.offset| (* (mod |ULTIMATE.start_main_~i~0#1| 4294967296) 8) (- 34359738368))) |ULTIMATE.start_main_#t~mem13#1|))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (+ |ULTIMATE.start_main_~i~0#1| 1) ~N~0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (not (= (+ (* (* |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~i~0#1|) 4) (* |ULTIMATE.start_main_~i~0#1| 4) 1) |ULTIMATE.start_main_#t~mem13#1|)))' at error location [2023-11-19 05:15:53,939 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:15:53,939 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:15:53,939 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 14 [2023-11-19 05:15:53,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552079680] [2023-11-19 05:15:53,939 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:15:53,940 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-19 05:15:53,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:53,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-19 05:15:53,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=316, Unknown=1, NotChecked=36, Total=420 [2023-11-19 05:15:53,942 INFO L87 Difference]: Start difference. First operand 27 states and 34 transitions. Second operand has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:55,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:55,376 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2023-11-19 05:15:55,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 05:15:55,377 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-19 05:15:55,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:55,378 INFO L225 Difference]: With dead ends: 34 [2023-11-19 05:15:55,378 INFO L226 Difference]: Without dead ends: 25 [2023-11-19 05:15:55,379 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=128, Invalid=475, Unknown=1, NotChecked=46, Total=650 [2023-11-19 05:15:55,380 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 10 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 16 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:55,381 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 24 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 73 Invalid, 0 Unknown, 16 Unchecked, 0.6s Time] [2023-11-19 05:15:55,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-19 05:15:55,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-11-19 05:15:55,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 24 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:55,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2023-11-19 05:15:55,395 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 12 [2023-11-19 05:15:55,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:55,396 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2023-11-19 05:15:55,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:15:55,396 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2023-11-19 05:15:55,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-19 05:15:55,397 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:55,397 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:55,421 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:55,613 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:55,613 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:55,614 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:55,614 INFO L85 PathProgramCache]: Analyzing trace with hash -2021672665, now seen corresponding path program 2 times [2023-11-19 05:15:55,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:55,614 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475172450] [2023-11-19 05:15:55,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:55,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:55,646 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:15:55,651 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [800917932] [2023-11-19 05:15:55,655 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:15:55,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:55,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:55,657 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:55,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 05:15:55,742 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-19 05:15:55,742 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:15:55,744 INFO L262 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-19 05:15:55,745 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:56,170 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:15:56,170 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:15:56,441 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:15:56,441 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:56,441 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475172450] [2023-11-19 05:15:56,441 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:15:56,442 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800917932] [2023-11-19 05:15:56,442 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [800917932] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:15:56,442 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [573608059] [2023-11-19 05:15:56,445 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:15:56,445 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:15:56,446 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:15:56,446 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:15:56,446 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:16:00,871 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:16:02,383 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1049#(and (or (and (<= (mod |ULTIMATE.start_main_~i~0#1| 4294967296) 2147483647) (= (select (select |#memory_int| |ULTIMATE.start_main_~b~0#1.base|) (+ |ULTIMATE.start_main_~b~0#1.offset| (* (mod |ULTIMATE.start_main_~i~0#1| 4294967296) 8))) |ULTIMATE.start_main_#t~mem13#1|)) (and (<= 2147483648 (mod |ULTIMATE.start_main_~i~0#1| 4294967296)) (= (select (select |#memory_int| |ULTIMATE.start_main_~b~0#1.base|) (+ |ULTIMATE.start_main_~b~0#1.offset| (* (mod |ULTIMATE.start_main_~i~0#1| 4294967296) 8) (- 34359738368))) |ULTIMATE.start_main_#t~mem13#1|))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= (+ |ULTIMATE.start_main_~i~0#1| 1) ~N~0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (not (= (+ (* (* |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_main_~i~0#1|) 4) (* |ULTIMATE.start_main_~i~0#1| 4) 1) |ULTIMATE.start_main_#t~mem13#1|)))' at error location [2023-11-19 05:16:02,383 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:16:02,384 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:16:02,384 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2023-11-19 05:16:02,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908327586] [2023-11-19 05:16:02,384 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:16:02,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 05:16:02,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:16:02,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 05:16:02,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2023-11-19 05:16:02,387 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:16:03,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:16:03,062 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2023-11-19 05:16:03,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-19 05:16:03,062 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-19 05:16:03,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:16:03,063 INFO L225 Difference]: With dead ends: 37 [2023-11-19 05:16:03,064 INFO L226 Difference]: Without dead ends: 30 [2023-11-19 05:16:03,065 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 19 SyntacticMatches, 5 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=79, Invalid=263, Unknown=0, NotChecked=0, Total=342 [2023-11-19 05:16:03,066 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 24 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 05:16:03,066 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 18 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-19 05:16:03,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-11-19 05:16:03,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 20. [2023-11-19 05:16:03,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:16:03,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2023-11-19 05:16:03,089 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 13 [2023-11-19 05:16:03,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:16:03,090 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2023-11-19 05:16:03,090 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:16:03,090 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2023-11-19 05:16:03,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-19 05:16:03,094 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:16:03,094 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:16:03,121 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 05:16:03,309 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:16:03,309 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:16:03,310 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:16:03,310 INFO L85 PathProgramCache]: Analyzing trace with hash -426879810, now seen corresponding path program 3 times [2023-11-19 05:16:03,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:16:03,310 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1148551786] [2023-11-19 05:16:03,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:16:03,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:16:03,352 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-11-19 05:16:03,352 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1199911004] [2023-11-19 05:16:03,353 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:16:03,353 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:16:03,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:16:03,354 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:16:03,365 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f995ad91-edc1-4afa-a7a2-ddf28f81cb75/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 05:16:03,701 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:16:03,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:16:03,704 INFO L262 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 38 conjunts are in the unsatisfiable core [2023-11-19 05:16:03,707 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:16:03,988 INFO L349 Elim1Store]: treesize reduction 26, result has 42.2 percent of original size [2023-11-19 05:16:03,988 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 36 treesize of output 64 [2023-11-19 05:16:04,022 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 7 [2023-11-19 05:16:04,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:16:04,128 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-19 05:16:04,180 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 12 [2023-11-19 05:16:04,388 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2023-11-19 05:16:04,524 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-19 05:16:04,704 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-19 05:16:04,849 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-19 05:16:04,990 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 27 [2023-11-19 05:16:05,260 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 46 [2023-11-19 05:16:05,484 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 6 select indices, 6 select index equivalence classes, 7 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 65 [2023-11-19 05:16:06,116 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 05:16:06,116 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:16:13,422 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_240 (Array Int Int))) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_ArrVal_240) |c_ULTIMATE.start_main_~b~0#1.base|) |c_ULTIMATE.start_main_~b~0#1.offset|) 1)) is different from false [2023-11-19 05:16:13,478 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 3 not checked. [2023-11-19 05:16:13,479 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:16:13,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1148551786] [2023-11-19 05:16:13,479 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-11-19 05:16:13,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1199911004] [2023-11-19 05:16:13,479 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1199911004] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:16:13,480 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1207216257] [2023-11-19 05:16:13,482 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-19 05:16:13,482 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:16:13,482 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:16:13,482 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:16:13,483 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:16:18,750 INFO L180 IcfgInterpreter]: Interpretation finished