./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_reverse_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_reverse_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash cce6de3c48d80c64796d0d47269c605ab237c0f177720038579dfa7efd061db0 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 18:29:35,856 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 18:29:35,929 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 18:29:35,934 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 18:29:35,934 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 18:29:35,961 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 18:29:35,962 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 18:29:35,963 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 18:29:35,963 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 18:29:35,964 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 18:29:35,965 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 18:29:35,965 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 18:29:35,966 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 18:29:35,966 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 18:29:35,967 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 18:29:35,967 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 18:29:35,968 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 18:29:35,968 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 18:29:35,969 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 18:29:35,970 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 18:29:35,970 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 18:29:35,971 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 18:29:35,972 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 18:29:35,972 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 18:29:35,973 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 18:29:35,973 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 18:29:35,974 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 18:29:35,974 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 18:29:35,975 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 18:29:35,975 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 18:29:35,976 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 18:29:35,976 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 18:29:35,976 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 18:29:35,977 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 18:29:35,977 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 18:29:35,977 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 18:29:35,977 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 18:29:35,978 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 18:29:35,978 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 18:29:35,978 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 18:29:35,978 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 18:29:35,979 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 18:29:35,979 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 18:29:35,979 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 18:29:35,980 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 18:29:35,980 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 18:29:35,980 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 18:29:35,980 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_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cce6de3c48d80c64796d0d47269c605ab237c0f177720038579dfa7efd061db0 [2023-12-02 18:29:36,206 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 18:29:36,226 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 18:29:36,229 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 18:29:36,231 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 18:29:36,231 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 18:29:36,232 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-examples/standard_reverse_ground.i [2023-12-02 18:29:38,998 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 18:29:39,176 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 18:29:39,177 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/sv-benchmarks/c/array-examples/standard_reverse_ground.i [2023-12-02 18:29:39,184 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/data/7d91ca4be/d1865df102894025a938dd06f0700e0a/FLAG278469cf8 [2023-12-02 18:29:39,195 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/data/7d91ca4be/d1865df102894025a938dd06f0700e0a [2023-12-02 18:29:39,197 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 18:29:39,199 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 18:29:39,200 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 18:29:39,200 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 18:29:39,205 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 18:29:39,206 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 06:29:39" (1/1) ... [2023-12-02 18:29:39,207 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@496538f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:29:39, skipping insertion in model container [2023-12-02 18:29:39,207 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 06:29:39" (1/1) ... [2023-12-02 18:29:39,229 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 18:29:39,378 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_379bc29c-d493-4e17-b760-a44ed7286080/sv-benchmarks/c/array-examples/standard_reverse_ground.i[816,829] [2023-12-02 18:29:39,391 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 18:29:39,401 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 18:29:39,414 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_379bc29c-d493-4e17-b760-a44ed7286080/sv-benchmarks/c/array-examples/standard_reverse_ground.i[816,829] [2023-12-02 18:29:39,421 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 18:29:39,436 INFO L206 MainTranslator]: Completed translation [2023-12-02 18:29:39,436 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:29:39 WrapperNode [2023-12-02 18:29:39,436 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 18:29:39,437 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 18:29:39,438 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 18:29:39,438 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 18:29:39,445 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:29:39" (1/1) ... [2023-12-02 18:29:39,452 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:29:39" (1/1) ... [2023-12-02 18:29:39,472 INFO L138 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 63 [2023-12-02 18:29:39,473 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 18:29:39,473 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 18:29:39,473 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 18:29:39,474 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 18:29:39,483 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:29:39" (1/1) ... [2023-12-02 18:29:39,484 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:29:39" (1/1) ... [2023-12-02 18:29:39,485 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:29:39" (1/1) ... [2023-12-02 18:29:39,486 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:29:39" (1/1) ... [2023-12-02 18:29:39,491 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:29:39" (1/1) ... [2023-12-02 18:29:39,495 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:29:39" (1/1) ... [2023-12-02 18:29:39,496 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:29:39" (1/1) ... [2023-12-02 18:29:39,498 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:29:39" (1/1) ... [2023-12-02 18:29:39,499 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 18:29:39,500 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 18:29:39,501 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 18:29:39,501 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 18:29:39,502 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:29:39" (1/1) ... [2023-12-02 18:29:39,508 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 18:29:39,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:29:39,532 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 18:29:39,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 18:29:39,573 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 18:29:39,573 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 18:29:39,573 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 18:29:39,573 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 18:29:39,573 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 18:29:39,573 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 18:29:39,574 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 18:29:39,574 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 18:29:39,643 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 18:29:39,645 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 18:29:39,783 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 18:29:39,822 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 18:29:39,822 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-12-02 18:29:39,823 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 06:29:39 BoogieIcfgContainer [2023-12-02 18:29:39,824 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 18:29:39,827 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 18:29:39,827 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 18:29:39,830 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 18:29:39,831 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 06:29:39" (1/3) ... [2023-12-02 18:29:39,831 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73ec37a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 06:29:39, skipping insertion in model container [2023-12-02 18:29:39,832 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:29:39" (2/3) ... [2023-12-02 18:29:39,832 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73ec37a6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 06:29:39, skipping insertion in model container [2023-12-02 18:29:39,832 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 06:29:39" (3/3) ... [2023-12-02 18:29:39,834 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_reverse_ground.i [2023-12-02 18:29:39,851 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 18:29:39,851 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 18:29:39,890 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 18:29:39,896 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;@811928, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 18:29:39,897 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 18:29:39,901 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:39,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-12-02 18:29:39,907 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:29:39,908 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-12-02 18:29:39,908 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:29:39,912 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:29:39,913 INFO L85 PathProgramCache]: Analyzing trace with hash -1598963128, now seen corresponding path program 1 times [2023-12-02 18:29:39,922 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:29:39,923 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1715621934] [2023-12-02 18:29:39,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:29:39,924 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:29:40,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:29:40,136 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:29:40,137 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:29:40,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1715621934] [2023-12-02 18:29:40,138 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1715621934] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:29:40,138 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:29:40,138 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 18:29:40,140 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196391513] [2023-12-02 18:29:40,141 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:29:40,146 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:29:40,146 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:29:40,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:29:40,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 18:29:40,180 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:40,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:29:40,219 INFO L93 Difference]: Finished difference Result 18 states and 25 transitions. [2023-12-02 18:29:40,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:29:40,222 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-12-02 18:29:40,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:29:40,234 INFO L225 Difference]: With dead ends: 18 [2023-12-02 18:29:40,234 INFO L226 Difference]: Without dead ends: 10 [2023-12-02 18:29:40,237 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 18:29:40,241 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:29:40,243 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 18:29:40,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2023-12-02 18:29:40,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2023-12-02 18:29:40,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:40,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2023-12-02 18:29:40,276 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 6 [2023-12-02 18:29:40,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:29:40,277 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2023-12-02 18:29:40,277 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:40,277 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2023-12-02 18:29:40,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 18:29:40,278 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:29:40,278 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:29:40,278 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 18:29:40,278 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:29:40,279 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:29:40,279 INFO L85 PathProgramCache]: Analyzing trace with hash -874573408, now seen corresponding path program 1 times [2023-12-02 18:29:40,280 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:29:40,280 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052414582] [2023-12-02 18:29:40,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:29:40,280 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:29:40,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:29:40,377 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:29:40,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:29:40,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052414582] [2023-12-02 18:29:40,378 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1052414582] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:29:40,378 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149977030] [2023-12-02 18:29:40,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:29:40,378 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:29:40,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:29:40,380 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:29:40,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 18:29:40,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:29:40,462 INFO L262 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 18:29:40,467 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:29:40,509 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:29:40,510 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:29:40,536 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:29:40,536 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1149977030] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:29:40,536 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [102389854] [2023-12-02 18:29:40,557 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-12-02 18:29:40,557 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:29:40,560 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:29:40,564 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:29:40,565 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:29:40,974 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:29:41,139 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '104#(and (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem6#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= |ULTIMATE.start_main_#t~mem7#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 399996)))' at error location [2023-12-02 18:29:41,139 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:29:41,139 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:29:41,139 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-12-02 18:29:41,140 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60703166] [2023-12-02 18:29:41,140 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:29:41,141 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 18:29:41,141 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:29:41,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 18:29:41,142 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2023-12-02 18:29:41,143 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:41,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:29:41,189 INFO L93 Difference]: Finished difference Result 23 states and 32 transitions. [2023-12-02 18:29:41,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 18:29:41,189 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-12-02 18:29:41,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:29:41,190 INFO L225 Difference]: With dead ends: 23 [2023-12-02 18:29:41,190 INFO L226 Difference]: Without dead ends: 16 [2023-12-02 18:29:41,191 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2023-12-02 18:29:41,192 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:29:41,193 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 18:29:41,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-12-02 18:29:41,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-12-02 18:29:41,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:41,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2023-12-02 18:29:41,198 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 8 [2023-12-02 18:29:41,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:29:41,198 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2023-12-02 18:29:41,199 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:41,199 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2023-12-02 18:29:41,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-12-02 18:29:41,199 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:29:41,200 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1] [2023-12-02 18:29:41,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 18:29:41,400 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:29:41,400 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:29:41,401 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:29:41,401 INFO L85 PathProgramCache]: Analyzing trace with hash -1268249400, now seen corresponding path program 2 times [2023-12-02 18:29:41,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:29:41,401 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545456518] [2023-12-02 18:29:41,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:29:41,402 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:29:41,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:29:41,550 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 18:29:41,550 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:29:41,550 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [545456518] [2023-12-02 18:29:41,551 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [545456518] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:29:41,551 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [159645089] [2023-12-02 18:29:41,551 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 18:29:41,551 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:29:41,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:29:41,553 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:29:41,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 18:29:41,630 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 18:29:41,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 18:29:41,632 INFO L262 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 18:29:41,635 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:29:41,663 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 18 treesize of output 16 [2023-12-02 18:29:41,735 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 23 treesize of output 23 [2023-12-02 18:29:41,841 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-12-02 18:29:41,842 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 18:29:41,842 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [159645089] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:29:41,842 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 18:29:41,842 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 10 [2023-12-02 18:29:41,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958989548] [2023-12-02 18:29:41,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:29:41,843 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 18:29:41,843 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:29:41,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 18:29:41,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2023-12-02 18:29:41,844 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:41,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:29:41,954 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2023-12-02 18:29:41,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 18:29:41,955 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 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 14 [2023-12-02 18:29:41,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:29:41,955 INFO L225 Difference]: With dead ends: 21 [2023-12-02 18:29:41,955 INFO L226 Difference]: Without dead ends: 19 [2023-12-02 18:29:41,956 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2023-12-02 18:29:41,957 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 18 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:29:41,958 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 6 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 18:29:41,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-12-02 18:29:41,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2023-12-02 18:29:41,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:41,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2023-12-02 18:29:41,965 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2023-12-02 18:29:41,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:29:41,965 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2023-12-02 18:29:41,965 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:41,965 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2023-12-02 18:29:41,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-12-02 18:29:41,966 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:29:41,966 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:29:41,971 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 18:29:42,168 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:29:42,168 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:29:42,169 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:29:42,169 INFO L85 PathProgramCache]: Analyzing trace with hash 414529814, now seen corresponding path program 1 times [2023-12-02 18:29:42,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:29:42,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1770524963] [2023-12-02 18:29:42,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:29:42,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:29:42,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:29:42,276 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 18:29:42,277 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:29:42,277 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1770524963] [2023-12-02 18:29:42,277 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1770524963] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:29:42,277 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [898000631] [2023-12-02 18:29:42,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:29:42,277 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:29:42,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:29:42,278 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:29:42,281 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 18:29:42,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:29:42,358 INFO L262 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 18:29:42,360 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:29:42,376 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 18:29:42,376 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:29:42,436 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 18:29:42,437 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [898000631] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:29:42,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1945506972] [2023-12-02 18:29:42,440 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:29:42,440 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:29:42,440 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:29:42,440 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:29:42,440 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:29:42,767 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:29:42,977 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '398#(and (= |ULTIMATE.start_main_#t~mem7#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ 399996 (* |ULTIMATE.start_main_~x~0#1| (- 4))))) (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4)) |ULTIMATE.start_main_#t~mem6#1|) (<= |ULTIMATE.start_main_~x~0#1| 99999) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 18:29:42,977 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:29:42,977 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:29:42,977 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-12-02 18:29:42,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682488284] [2023-12-02 18:29:42,978 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:29:42,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 18:29:42,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:29:42,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 18:29:42,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2023-12-02 18:29:42,979 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:43,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:29:43,049 INFO L93 Difference]: Finished difference Result 42 states and 57 transitions. [2023-12-02 18:29:43,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 18:29:43,049 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-12-02 18:29:43,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:29:43,050 INFO L225 Difference]: With dead ends: 42 [2023-12-02 18:29:43,050 INFO L226 Difference]: Without dead ends: 30 [2023-12-02 18:29:43,051 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2023-12-02 18:29:43,052 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:29:43,052 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:29:43,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2023-12-02 18:29:43,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2023-12-02 18:29:43,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:43,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2023-12-02 18:29:43,062 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 17 [2023-12-02 18:29:43,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:29:43,062 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2023-12-02 18:29:43,062 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:43,062 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2023-12-02 18:29:43,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-12-02 18:29:43,063 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:29:43,063 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:29:43,069 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 18:29:43,264 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:29:43,264 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:29:43,265 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:29:43,265 INFO L85 PathProgramCache]: Analyzing trace with hash -1965670058, now seen corresponding path program 2 times [2023-12-02 18:29:43,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:29:43,265 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1665455679] [2023-12-02 18:29:43,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:29:43,265 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:29:43,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:29:43,522 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-12-02 18:29:43,522 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:29:43,522 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1665455679] [2023-12-02 18:29:43,522 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1665455679] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:29:43,522 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1238460842] [2023-12-02 18:29:43,522 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 18:29:43,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:29:43,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:29:43,528 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:29:43,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 18:29:43,621 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 18:29:43,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 18:29:43,623 INFO L262 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 31 conjunts are in the unsatisfiable core [2023-12-02 18:29:43,626 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:29:43,633 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 [2023-12-02 18:29:43,718 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 24 treesize of output 24 [2023-12-02 18:29:43,755 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 44 treesize of output 27 [2023-12-02 18:29:43,916 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 18 proven. 3 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2023-12-02 18:29:43,916 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:29:44,070 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 29 treesize of output 23 [2023-12-02 18:29:44,115 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2023-12-02 18:29:44,116 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1238460842] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:29:44,116 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1689466691] [2023-12-02 18:29:44,118 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:29:44,118 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:29:44,119 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:29:44,119 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:29:44,119 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:29:44,388 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:29:44,868 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '723#(and (= |ULTIMATE.start_main_#t~mem7#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ 399996 (* |ULTIMATE.start_main_~x~0#1| (- 4))))) (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4)) |ULTIMATE.start_main_#t~mem6#1|) (<= |ULTIMATE.start_main_~x~0#1| 99999) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 18:29:44,868 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:29:44,868 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:29:44,868 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7, 7] total 24 [2023-12-02 18:29:44,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97388190] [2023-12-02 18:29:44,869 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:29:44,869 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-12-02 18:29:44,869 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:29:44,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-12-02 18:29:44,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=702, Unknown=0, NotChecked=0, Total=870 [2023-12-02 18:29:44,871 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 25 states, 25 states have (on average 1.72) internal successors, (43), 24 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:45,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:29:45,820 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2023-12-02 18:29:45,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-12-02 18:29:45,821 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.72) internal successors, (43), 24 states have internal predecessors, (43), 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 29 [2023-12-02 18:29:45,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:29:45,821 INFO L225 Difference]: With dead ends: 57 [2023-12-02 18:29:45,821 INFO L226 Difference]: Without dead ends: 39 [2023-12-02 18:29:45,823 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 58 SyntacticMatches, 11 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 964 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=774, Invalid=2766, Unknown=0, NotChecked=0, Total=3540 [2023-12-02 18:29:45,823 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 58 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:29:45,824 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 16 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:29:45,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-12-02 18:29:45,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 35. [2023-12-02 18:29:45,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:45,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2023-12-02 18:29:45,833 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 29 [2023-12-02 18:29:45,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:29:45,833 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2023-12-02 18:29:45,833 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.72) internal successors, (43), 24 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:45,833 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2023-12-02 18:29:45,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-12-02 18:29:45,834 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:29:45,834 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 3, 2, 2, 1, 1, 1, 1, 1] [2023-12-02 18:29:45,838 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 18:29:46,035 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:29:46,035 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:29:46,035 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:29:46,035 INFO L85 PathProgramCache]: Analyzing trace with hash -555005664, now seen corresponding path program 3 times [2023-12-02 18:29:46,035 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:29:46,035 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395888238] [2023-12-02 18:29:46,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:29:46,036 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:29:46,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:29:46,292 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2023-12-02 18:29:46,293 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:29:46,293 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395888238] [2023-12-02 18:29:46,293 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395888238] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:29:46,293 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1657971725] [2023-12-02 18:29:46,293 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 18:29:46,293 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:29:46,293 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:29:46,294 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:29:46,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 18:29:46,388 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 18:29:46,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 18:29:46,390 INFO L262 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 13 conjunts are in the unsatisfiable core [2023-12-02 18:29:46,391 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:29:46,418 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2023-12-02 18:29:46,418 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:29:46,612 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2023-12-02 18:29:46,613 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1657971725] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:29:46,613 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1029319601] [2023-12-02 18:29:46,615 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:29:46,615 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:29:46,615 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:29:46,615 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:29:46,615 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:29:46,790 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:29:47,126 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1175#(and (= |ULTIMATE.start_main_#t~mem7#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ 399996 (* |ULTIMATE.start_main_~x~0#1| (- 4))))) (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4)) |ULTIMATE.start_main_#t~mem6#1|) (<= |ULTIMATE.start_main_~x~0#1| 99999) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 18:29:47,126 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:29:47,126 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:29:47,126 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2023-12-02 18:29:47,127 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693317762] [2023-12-02 18:29:47,127 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:29:47,127 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-12-02 18:29:47,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:29:47,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-12-02 18:29:47,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=622, Unknown=0, NotChecked=0, Total=992 [2023-12-02 18:29:47,129 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 26 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:47,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:29:47,243 INFO L93 Difference]: Finished difference Result 83 states and 112 transitions. [2023-12-02 18:29:47,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-12-02 18:29:47,244 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 26 states have internal predecessors, (35), 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 34 [2023-12-02 18:29:47,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:29:47,245 INFO L225 Difference]: With dead ends: 83 [2023-12-02 18:29:47,245 INFO L226 Difference]: Without dead ends: 61 [2023-12-02 18:29:47,246 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 71 SyntacticMatches, 12 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 659 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=370, Invalid=622, Unknown=0, NotChecked=0, Total=992 [2023-12-02 18:29:47,247 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:29:47,247 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:29:47,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-12-02 18:29:47,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2023-12-02 18:29:47,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:47,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2023-12-02 18:29:47,267 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 34 [2023-12-02 18:29:47,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:29:47,267 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2023-12-02 18:29:47,268 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 26 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:47,268 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2023-12-02 18:29:47,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2023-12-02 18:29:47,269 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:29:47,270 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 3, 2, 2, 1, 1, 1, 1, 1] [2023-12-02 18:29:47,275 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 18:29:47,470 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:29:47,470 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:29:47,471 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:29:47,471 INFO L85 PathProgramCache]: Analyzing trace with hash 355833480, now seen corresponding path program 4 times [2023-12-02 18:29:47,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:29:47,471 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1127427207] [2023-12-02 18:29:47,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:29:47,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:29:47,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:29:48,143 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 307 trivial. 0 not checked. [2023-12-02 18:29:48,143 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:29:48,143 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1127427207] [2023-12-02 18:29:48,143 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1127427207] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:29:48,143 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [522868711] [2023-12-02 18:29:48,143 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 18:29:48,144 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:29:48,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:29:48,145 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:29:48,149 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 18:29:48,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:29:48,286 INFO L262 TraceCheckSpWp]: Trace formula consists of 467 conjuncts, 26 conjunts are in the unsatisfiable core [2023-12-02 18:29:48,290 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:29:48,336 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 307 trivial. 0 not checked. [2023-12-02 18:29:48,336 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:29:48,972 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 307 trivial. 0 not checked. [2023-12-02 18:29:48,972 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [522868711] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:29:48,972 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1878944200] [2023-12-02 18:29:48,974 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:29:48,974 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:29:48,975 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:29:48,975 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:29:48,975 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:29:49,140 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:29:49,939 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1852#(and (= |ULTIMATE.start_main_#t~mem7#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ 399996 (* |ULTIMATE.start_main_~x~0#1| (- 4))))) (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4)) |ULTIMATE.start_main_#t~mem6#1|) (<= |ULTIMATE.start_main_~x~0#1| 99999) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 18:29:49,939 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:29:49,939 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:29:49,939 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 52 [2023-12-02 18:29:49,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126529744] [2023-12-02 18:29:49,939 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:29:49,940 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2023-12-02 18:29:49,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:29:49,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2023-12-02 18:29:49,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1397, Invalid=1909, Unknown=0, NotChecked=0, Total=3306 [2023-12-02 18:29:49,944 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 53 states, 53 states have (on average 1.150943396226415) internal successors, (61), 52 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:50,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:29:50,285 INFO L93 Difference]: Finished difference Result 148 states and 203 transitions. [2023-12-02 18:29:50,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2023-12-02 18:29:50,286 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.150943396226415) internal successors, (61), 52 states have internal predecessors, (61), 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 60 [2023-12-02 18:29:50,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:29:50,287 INFO L225 Difference]: With dead ends: 148 [2023-12-02 18:29:50,287 INFO L226 Difference]: Without dead ends: 113 [2023-12-02 18:29:50,289 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 123 SyntacticMatches, 25 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2349 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1397, Invalid=1909, Unknown=0, NotChecked=0, Total=3306 [2023-12-02 18:29:50,289 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 281 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 281 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 18:29:50,289 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [281 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 18:29:50,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2023-12-02 18:29:50,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2023-12-02 18:29:50,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.0267857142857142) internal successors, (115), 112 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:50,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2023-12-02 18:29:50,324 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 60 [2023-12-02 18:29:50,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:29:50,325 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2023-12-02 18:29:50,325 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.150943396226415) internal successors, (61), 52 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:29:50,325 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2023-12-02 18:29:50,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2023-12-02 18:29:50,328 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:29:50,328 INFO L195 NwaCegarLoop]: trace histogram [50, 50, 3, 2, 2, 1, 1, 1, 1, 1] [2023-12-02 18:29:50,333 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 18:29:50,529 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:29:50,529 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:29:50,529 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:29:50,529 INFO L85 PathProgramCache]: Analyzing trace with hash 766655176, now seen corresponding path program 5 times [2023-12-02 18:29:50,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:29:50,530 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2036687008] [2023-12-02 18:29:50,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:29:50,530 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:29:50,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:29:52,980 INFO L134 CoverageAnalysis]: Checked inductivity of 2557 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 1282 trivial. 0 not checked. [2023-12-02 18:29:52,981 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:29:52,981 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2036687008] [2023-12-02 18:29:52,981 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2036687008] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:29:52,981 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596897338] [2023-12-02 18:29:52,981 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 18:29:52,981 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:29:52,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:29:52,982 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:29:52,983 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 18:29:53,169 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 18:29:53,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 18:29:53,171 INFO L262 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 48 conjunts are in the unsatisfiable core [2023-12-02 18:29:53,178 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:29:53,182 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 [2023-12-02 18:29:53,483 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 24 treesize of output 24 [2023-12-02 18:29:53,519 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 46 treesize of output 27 [2023-12-02 18:29:53,571 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 44 treesize of output 27 [2023-12-02 18:29:53,928 INFO L134 CoverageAnalysis]: Checked inductivity of 2557 backedges. 144 proven. 109 refuted. 0 times theorem prover too weak. 2304 trivial. 0 not checked. [2023-12-02 18:29:53,928 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:29:54,366 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 91 treesize of output 73 [2023-12-02 18:29:54,507 INFO L134 CoverageAnalysis]: Checked inductivity of 2557 backedges. 0 proven. 154 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2023-12-02 18:29:54,507 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596897338] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:29:54,507 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [561484416] [2023-12-02 18:29:54,509 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:29:54,510 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:29:54,510 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:29:54,510 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:29:54,510 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:29:54,700 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:29:57,579 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3095#(and (= |ULTIMATE.start_main_#t~mem7#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ 399996 (* |ULTIMATE.start_main_~x~0#1| (- 4))))) (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4)) |ULTIMATE.start_main_#t~mem6#1|) (<= |ULTIMATE.start_main_~x~0#1| 99999) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 18:29:57,580 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:29:57,580 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:29:57,580 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 12, 10] total 72 [2023-12-02 18:29:57,580 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145575304] [2023-12-02 18:29:57,580 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:29:57,581 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2023-12-02 18:29:57,581 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:29:57,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2023-12-02 18:29:57,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1752, Invalid=4254, Unknown=0, NotChecked=0, Total=6006 [2023-12-02 18:29:57,585 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand has 73 states, 73 states have (on average 1.273972602739726) internal successors, (93), 72 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:30:06,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:30:06,935 INFO L93 Difference]: Finished difference Result 185 states and 194 transitions. [2023-12-02 18:30:06,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2023-12-02 18:30:06,935 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 1.273972602739726) internal successors, (93), 72 states have internal predecessors, (93), 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 112 [2023-12-02 18:30:06,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:30:06,937 INFO L225 Difference]: With dead ends: 185 [2023-12-02 18:30:06,937 INFO L226 Difference]: Without dead ends: 124 [2023-12-02 18:30:06,947 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 499 GetRequests, 259 SyntacticMatches, 51 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11863 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=9595, Invalid=26693, Unknown=2, NotChecked=0, Total=36290 [2023-12-02 18:30:06,948 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 81 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 305 mSolverCounterSat, 163 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 469 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 163 IncrementalHoareTripleChecker+Valid, 305 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-12-02 18:30:06,948 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 26 Invalid, 469 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [163 Valid, 305 Invalid, 1 Unknown, 0 Unchecked, 0.9s Time] [2023-12-02 18:30:06,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2023-12-02 18:30:06,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 118. [2023-12-02 18:30:06,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.0256410256410255) internal successors, (120), 117 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:30:06,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 120 transitions. [2023-12-02 18:30:06,989 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 120 transitions. Word has length 112 [2023-12-02 18:30:06,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:30:06,989 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 120 transitions. [2023-12-02 18:30:06,989 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 1.273972602739726) internal successors, (93), 72 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:30:06,989 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 120 transitions. [2023-12-02 18:30:06,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2023-12-02 18:30:06,991 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:30:06,991 INFO L195 NwaCegarLoop]: trace histogram [51, 51, 4, 3, 3, 1, 1, 1, 1, 1] [2023-12-02 18:30:06,995 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 18:30:07,191 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:30:07,191 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:30:07,192 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:30:07,192 INFO L85 PathProgramCache]: Analyzing trace with hash -130446146, now seen corresponding path program 6 times [2023-12-02 18:30:07,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:30:07,192 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922664232] [2023-12-02 18:30:07,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:30:07,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:30:07,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:30:09,140 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 1341 trivial. 0 not checked. [2023-12-02 18:30:09,140 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:30:09,140 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922664232] [2023-12-02 18:30:09,140 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [922664232] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:30:09,140 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1360916960] [2023-12-02 18:30:09,140 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 18:30:09,140 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:30:09,140 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:30:09,141 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:30:09,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 18:30:09,402 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 18:30:09,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 18:30:09,407 INFO L262 TraceCheckSpWp]: Trace formula consists of 911 conjuncts, 53 conjunts are in the unsatisfiable core [2023-12-02 18:30:09,411 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:30:09,491 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 1341 trivial. 0 not checked. [2023-12-02 18:30:09,491 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:30:12,038 INFO L134 CoverageAnalysis]: Checked inductivity of 2667 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 1341 trivial. 0 not checked. [2023-12-02 18:30:12,039 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1360916960] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:30:12,039 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2015675061] [2023-12-02 18:30:12,041 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:30:12,041 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:30:12,041 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:30:12,041 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:30:12,041 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:30:12,216 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:30:14,226 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4707#(and (= |ULTIMATE.start_main_#t~mem7#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ 399996 (* |ULTIMATE.start_main_~x~0#1| (- 4))))) (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4)) |ULTIMATE.start_main_#t~mem6#1|) (<= |ULTIMATE.start_main_~x~0#1| 99999) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 18:30:14,226 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:30:14,226 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:30:14,227 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 106 [2023-12-02 18:30:14,227 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731999453] [2023-12-02 18:30:14,227 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:30:14,228 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2023-12-02 18:30:14,228 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:30:14,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2023-12-02 18:30:14,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5690, Invalid=6742, Unknown=0, NotChecked=0, Total=12432 [2023-12-02 18:30:14,233 INFO L87 Difference]: Start difference. First operand 118 states and 120 transitions. Second operand has 107 states, 107 states have (on average 1.074766355140187) internal successors, (115), 106 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:30:15,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:30:15,222 INFO L93 Difference]: Finished difference Result 289 states and 398 transitions. [2023-12-02 18:30:15,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2023-12-02 18:30:15,223 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 1.074766355140187) internal successors, (115), 106 states have internal predecessors, (115), 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 117 [2023-12-02 18:30:15,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:30:15,224 INFO L225 Difference]: With dead ends: 289 [2023-12-02 18:30:15,224 INFO L226 Difference]: Without dead ends: 224 [2023-12-02 18:30:15,226 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 240 SyntacticMatches, 52 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9099 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=5690, Invalid=6742, Unknown=0, NotChecked=0, Total=12432 [2023-12-02 18:30:15,226 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 481 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 711 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 481 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 18:30:15,227 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 711 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [481 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 18:30:15,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2023-12-02 18:30:15,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 224. [2023-12-02 18:30:15,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 223 states have (on average 1.0134529147982063) internal successors, (226), 223 states have internal predecessors, (226), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:30:15,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 226 transitions. [2023-12-02 18:30:15,303 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 226 transitions. Word has length 117 [2023-12-02 18:30:15,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:30:15,303 INFO L495 AbstractCegarLoop]: Abstraction has 224 states and 226 transitions. [2023-12-02 18:30:15,303 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 1.074766355140187) internal successors, (115), 106 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:30:15,303 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 226 transitions. [2023-12-02 18:30:15,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2023-12-02 18:30:15,307 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:30:15,308 INFO L195 NwaCegarLoop]: trace histogram [104, 104, 4, 3, 3, 1, 1, 1, 1, 1] [2023-12-02 18:30:15,313 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-12-02 18:30:15,508 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:30:15,508 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:30:15,509 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:30:15,509 INFO L85 PathProgramCache]: Analyzing trace with hash -1547582122, now seen corresponding path program 7 times [2023-12-02 18:30:15,509 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:30:15,509 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073574996] [2023-12-02 18:30:15,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:30:15,509 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:30:15,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:30:22,423 INFO L134 CoverageAnalysis]: Checked inductivity of 10935 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 5475 trivial. 0 not checked. [2023-12-02 18:30:22,423 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:30:22,423 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073574996] [2023-12-02 18:30:22,424 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1073574996] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:30:22,424 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2033298631] [2023-12-02 18:30:22,424 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 18:30:22,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:30:22,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:30:22,425 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:30:22,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 18:30:22,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:30:22,855 INFO L262 TraceCheckSpWp]: Trace formula consists of 1759 conjuncts, 106 conjunts are in the unsatisfiable core [2023-12-02 18:30:22,860 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:30:23,003 INFO L134 CoverageAnalysis]: Checked inductivity of 10935 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 5475 trivial. 0 not checked. [2023-12-02 18:30:23,004 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:30:33,466 INFO L134 CoverageAnalysis]: Checked inductivity of 10935 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 5475 trivial. 0 not checked. [2023-12-02 18:30:33,466 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2033298631] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:30:33,466 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1075858713] [2023-12-02 18:30:33,467 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:30:33,467 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:30:33,468 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:30:33,468 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:30:33,468 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:30:33,688 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:30:40,066 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7254#(and (<= |ULTIMATE.start_main_~x~0#1| 99999) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_#t~mem7#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| 399996 (* |ULTIMATE.start_main_~x~0#1| (- 4))))) (or (and (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (<= 1 |ULTIMATE.start_main_~x~0#1|) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0)) (and (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_~x~0#1| 0))) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~x~0#1| 4))) |ULTIMATE.start_main_#t~mem6#1|))' at error location [2023-12-02 18:30:40,066 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:30:40,066 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:30:40,067 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106, 106] total 212 [2023-12-02 18:30:40,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162384140] [2023-12-02 18:30:40,067 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:30:40,068 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 213 states [2023-12-02 18:30:40,068 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:30:40,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 213 interpolants. [2023-12-02 18:30:40,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22596, Invalid=24710, Unknown=0, NotChecked=0, Total=47306 [2023-12-02 18:30:40,079 INFO L87 Difference]: Start difference. First operand 224 states and 226 transitions. Second operand has 213 states, 213 states have (on average 1.0375586854460095) internal successors, (221), 212 states have internal predecessors, (221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:30:46,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:30:46,716 INFO L93 Difference]: Finished difference Result 554 states and 769 transitions. [2023-12-02 18:30:46,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2023-12-02 18:30:46,717 INFO L78 Accepts]: Start accepts. Automaton has has 213 states, 213 states have (on average 1.0375586854460095) internal successors, (221), 212 states have internal predecessors, (221), 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 223 [2023-12-02 18:30:46,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:30:46,719 INFO L225 Difference]: With dead ends: 554 [2023-12-02 18:30:46,719 INFO L226 Difference]: Without dead ends: 436 [2023-12-02 18:30:46,721 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 773 GetRequests, 452 SyntacticMatches, 105 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35069 ImplicationChecksByTransitivity, 20.2s TimeCoverageRelationStatistics Valid=22596, Invalid=24710, Unknown=0, NotChecked=0, Total=47306 [2023-12-02 18:30:46,722 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 442 mSolverCounterSat, 1108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 1550 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1108 IncrementalHoareTripleChecker+Valid, 442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-12-02 18:30:46,722 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 32 Invalid, 1550 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1108 Valid, 442 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-12-02 18:30:46,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 436 states. [2023-12-02 18:30:46,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 436 to 436. [2023-12-02 18:30:46,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 436 states, 435 states have (on average 1.006896551724138) internal successors, (438), 435 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:30:46,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 436 states to 436 states and 438 transitions. [2023-12-02 18:30:46,905 INFO L78 Accepts]: Start accepts. Automaton has 436 states and 438 transitions. Word has length 223 [2023-12-02 18:30:46,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:30:46,906 INFO L495 AbstractCegarLoop]: Abstraction has 436 states and 438 transitions. [2023-12-02 18:30:46,906 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 213 states, 213 states have (on average 1.0375586854460095) internal successors, (221), 212 states have internal predecessors, (221), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:30:46,906 INFO L276 IsEmpty]: Start isEmpty. Operand 436 states and 438 transitions. [2023-12-02 18:30:46,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 436 [2023-12-02 18:30:46,915 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:30:46,915 INFO L195 NwaCegarLoop]: trace histogram [210, 210, 4, 3, 3, 1, 1, 1, 1, 1] [2023-12-02 18:30:46,923 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-12-02 18:30:47,115 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 18:30:47,116 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:30:47,116 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:30:47,116 INFO L85 PathProgramCache]: Analyzing trace with hash -739170538, now seen corresponding path program 8 times [2023-12-02 18:30:47,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:30:47,116 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981103220] [2023-12-02 18:30:47,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:30:47,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:30:47,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:31:16,374 INFO L134 CoverageAnalysis]: Checked inductivity of 44325 backedges. 0 proven. 22155 refuted. 0 times theorem prover too weak. 22170 trivial. 0 not checked. [2023-12-02 18:31:16,374 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:31:16,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981103220] [2023-12-02 18:31:16,374 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [981103220] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:31:16,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1104991662] [2023-12-02 18:31:16,374 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 18:31:16,375 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:31:16,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:31:16,375 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:31:16,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 18:31:16,861 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 18:31:16,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 18:31:16,865 INFO L262 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 46 conjunts are in the unsatisfiable core [2023-12-02 18:31:16,877 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:31:16,882 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 18 treesize of output 16 [2023-12-02 18:31:17,996 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 24 treesize of output 24 [2023-12-02 18:31:18,111 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 46 treesize of output 27 [2023-12-02 18:31:18,229 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 46 treesize of output 27 [2023-12-02 18:31:18,362 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 44 treesize of output 27 [2023-12-02 18:31:19,483 INFO L134 CoverageAnalysis]: Checked inductivity of 44325 backedges. 828 proven. 21 refuted. 0 times theorem prover too weak. 43476 trivial. 0 not checked. [2023-12-02 18:31:19,483 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:31:21,267 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 1874 treesize of output 1538 [2023-12-02 18:31:21,711 INFO L134 CoverageAnalysis]: Checked inductivity of 44325 backedges. 0 proven. 849 refuted. 0 times theorem prover too weak. 43476 trivial. 0 not checked. [2023-12-02 18:31:21,711 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1104991662] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:31:21,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1118548116] [2023-12-02 18:31:21,713 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:31:21,713 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:31:21,713 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:31:21,713 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:31:21,714 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:31:21,853 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:31:48,341 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12049#(and (= |ULTIMATE.start_main_#t~mem7#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ 399996 (* |ULTIMATE.start_main_~x~0#1| (- 4))))) (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4)) |ULTIMATE.start_main_#t~mem6#1|) (<= |ULTIMATE.start_main_~x~0#1| 99999) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 18:31:48,342 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:31:48,342 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:31:48,342 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [212, 12, 12] total 234 [2023-12-02 18:31:48,342 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918786774] [2023-12-02 18:31:48,343 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:31:48,344 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 235 states [2023-12-02 18:31:48,344 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:31:48,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 235 interpolants. [2023-12-02 18:31:48,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23554, Invalid=33806, Unknown=0, NotChecked=0, Total=57360 [2023-12-02 18:31:48,353 INFO L87 Difference]: Start difference. First operand 436 states and 438 transitions. Second operand has 235 states, 235 states have (on average 1.102127659574468) internal successors, (259), 234 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:33:22,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:33:22,190 INFO L93 Difference]: Finished difference Result 671 states and 681 transitions. [2023-12-02 18:33:22,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 440 states. [2023-12-02 18:33:22,191 INFO L78 Accepts]: Start accepts. Automaton has has 235 states, 235 states have (on average 1.102127659574468) internal successors, (259), 234 states have internal predecessors, (259), 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 435 [2023-12-02 18:33:22,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:33:22,195 INFO L225 Difference]: With dead ends: 671 [2023-12-02 18:33:22,195 INFO L226 Difference]: Without dead ends: 447 [2023-12-02 18:33:22,220 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1952 GetRequests, 1066 SyntacticMatches, 211 SemanticMatches, 675 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150821 ImplicationChecksByTransitivity, 127.3s TimeCoverageRelationStatistics Valid=140741, Invalid=316909, Unknown=2, NotChecked=0, Total=457652 [2023-12-02 18:33:22,220 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 114 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 658 mSolverCounterSat, 1304 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 1965 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1304 IncrementalHoareTripleChecker+Valid, 658 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2023-12-02 18:33:22,220 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 25 Invalid, 1965 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1304 Valid, 658 Invalid, 3 Unknown, 0 Unchecked, 3.4s Time] [2023-12-02 18:33:22,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 447 states. [2023-12-02 18:33:22,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 447 to 441. [2023-12-02 18:33:22,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 440 states have (on average 1.0068181818181818) internal successors, (443), 440 states have internal predecessors, (443), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:33:22,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 443 transitions. [2023-12-02 18:33:22,402 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 443 transitions. Word has length 435 [2023-12-02 18:33:22,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:33:22,403 INFO L495 AbstractCegarLoop]: Abstraction has 441 states and 443 transitions. [2023-12-02 18:33:22,403 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 235 states, 235 states have (on average 1.102127659574468) internal successors, (259), 234 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:33:22,403 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 443 transitions. [2023-12-02 18:33:22,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 441 [2023-12-02 18:33:22,409 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:33:22,409 INFO L195 NwaCegarLoop]: trace histogram [211, 211, 5, 4, 4, 1, 1, 1, 1, 1] [2023-12-02 18:33:22,414 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 18:33:22,609 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:33:22,609 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:33:22,610 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:33:22,610 INFO L85 PathProgramCache]: Analyzing trace with hash 714436960, now seen corresponding path program 9 times [2023-12-02 18:33:22,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:33:22,610 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150341566] [2023-12-02 18:33:22,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:33:22,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:33:22,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:33:51,488 INFO L134 CoverageAnalysis]: Checked inductivity of 44758 backedges. 0 proven. 22366 refuted. 0 times theorem prover too weak. 22392 trivial. 0 not checked. [2023-12-02 18:33:51,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:33:51,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150341566] [2023-12-02 18:33:51,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150341566] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:33:51,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1698313472] [2023-12-02 18:33:51,489 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 18:33:51,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:33:51,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:33:51,490 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:33:51,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 18:33:52,279 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 18:33:52,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 18:33:52,297 INFO L262 TraceCheckSpWp]: Trace formula consists of 3483 conjuncts, 213 conjunts are in the unsatisfiable core [2023-12-02 18:33:52,306 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:33:52,553 INFO L134 CoverageAnalysis]: Checked inductivity of 44758 backedges. 0 proven. 22366 refuted. 0 times theorem prover too weak. 22392 trivial. 0 not checked. [2023-12-02 18:33:52,553 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:34:34,815 INFO L134 CoverageAnalysis]: Checked inductivity of 44758 backedges. 0 proven. 22366 refuted. 0 times theorem prover too weak. 22392 trivial. 0 not checked. [2023-12-02 18:34:34,815 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1698313472] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:34:34,815 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1443222111] [2023-12-02 18:34:34,817 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:34:34,817 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:34:34,817 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:34:34,817 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:34:34,817 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:34:34,983 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:35:02,592 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18179#(and (= |ULTIMATE.start_main_#t~mem7#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ 399996 (* |ULTIMATE.start_main_~x~0#1| (- 4))))) (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4)) |ULTIMATE.start_main_#t~mem6#1|) (<= |ULTIMATE.start_main_~x~0#1| 99999) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 18:35:02,592 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:35:02,592 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:35:02,593 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [213, 213, 213] total 426 [2023-12-02 18:35:02,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475306650] [2023-12-02 18:35:02,593 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:35:02,594 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 427 states [2023-12-02 18:35:02,595 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:35:02,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 427 interpolants. [2023-12-02 18:35:02,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90970, Invalid=95222, Unknown=0, NotChecked=0, Total=186192 [2023-12-02 18:35:02,626 INFO L87 Difference]: Start difference. First operand 441 states and 443 transitions. Second operand has 427 states, 427 states have (on average 1.018735362997658) internal successors, (435), 426 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:33,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:36:33,034 INFO L93 Difference]: Finished difference Result 1095 states and 1524 transitions. [2023-12-02 18:36:33,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 426 states. [2023-12-02 18:36:33,035 INFO L78 Accepts]: Start accepts. Automaton has has 427 states, 427 states have (on average 1.018735362997658) internal successors, (435), 426 states have internal predecessors, (435), 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 440 [2023-12-02 18:36:33,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:36:33,040 INFO L225 Difference]: With dead ends: 1095 [2023-12-02 18:36:33,040 INFO L226 Difference]: Without dead ends: 867 [2023-12-02 18:36:33,048 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1531 GetRequests, 889 SyntacticMatches, 212 SemanticMatches, 430 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138859 ImplicationChecksByTransitivity, 83.3s TimeCoverageRelationStatistics Valid=90970, Invalid=95222, Unknown=0, NotChecked=0, Total=186192 [2023-12-02 18:36:33,048 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 860 mSolverCounterSat, 3061 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 3921 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3061 IncrementalHoareTripleChecker+Valid, 860 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2023-12-02 18:36:33,048 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 3921 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3061 Valid, 860 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2023-12-02 18:36:33,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 867 states. [2023-12-02 18:36:33,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 867 to 867. [2023-12-02 18:36:33,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 867 states, 866 states have (on average 1.0034642032332564) internal successors, (869), 866 states have internal predecessors, (869), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:33,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 869 transitions. [2023-12-02 18:36:33,461 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 869 transitions. Word has length 440 [2023-12-02 18:36:33,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:36:33,461 INFO L495 AbstractCegarLoop]: Abstraction has 867 states and 869 transitions. [2023-12-02 18:36:33,462 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 427 states, 427 states have (on average 1.018735362997658) internal successors, (435), 426 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:33,462 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 869 transitions. [2023-12-02 18:36:33,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 867 [2023-12-02 18:36:33,470 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:36:33,471 INFO L195 NwaCegarLoop]: trace histogram [424, 424, 5, 4, 4, 1, 1, 1, 1, 1] [2023-12-02 18:36:33,481 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 18:36:33,671 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 18:36:33,672 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:36:33,672 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:36:33,672 INFO L85 PathProgramCache]: Analyzing trace with hash -2079828536, now seen corresponding path program 10 times [2023-12-02 18:36:33,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:36:33,672 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612369439] [2023-12-02 18:36:33,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:36:33,672 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:36:35,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:38:48,043 INFO L134 CoverageAnalysis]: Checked inductivity of 180226 backedges. 0 proven. 90100 refuted. 0 times theorem prover too weak. 90126 trivial. 0 not checked. [2023-12-02 18:38:48,043 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:38:48,043 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612369439] [2023-12-02 18:38:48,043 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [612369439] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:38:48,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1041526416] [2023-12-02 18:38:48,044 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 18:38:48,044 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:38:48,044 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:38:48,045 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:38:48,046 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_379bc29c-d493-4e17-b760-a44ed7286080/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 18:38:49,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:38:49,730 INFO L262 TraceCheckSpWp]: Trace formula consists of 6891 conjuncts, 426 conjunts are in the unsatisfiable core [2023-12-02 18:38:49,746 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:38:50,206 INFO L134 CoverageAnalysis]: Checked inductivity of 180226 backedges. 0 proven. 90100 refuted. 0 times theorem prover too weak. 90126 trivial. 0 not checked. [2023-12-02 18:38:50,206 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:41:43,188 INFO L134 CoverageAnalysis]: Checked inductivity of 180226 backedges. 0 proven. 90100 refuted. 0 times theorem prover too weak. 90126 trivial. 0 not checked. [2023-12-02 18:41:43,188 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1041526416] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:41:43,188 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [911742885] [2023-12-02 18:41:43,190 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:41:43,190 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:41:43,191 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:41:43,191 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:41:43,191 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:41:43,327 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:41:44,832 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28116#(and (= |ULTIMATE.start_main_#t~mem7#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ 399996 (* |ULTIMATE.start_main_~x~0#1| (- 4))))) (<= 1 |#StackHeapBarrier|) (<= 100000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~x~0#1| 4)) |ULTIMATE.start_main_#t~mem6#1|) (<= |ULTIMATE.start_main_~x~0#1| 99999) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (not (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|)) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-12-02 18:41:44,833 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:41:44,833 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:41:44,834 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [426, 426, 426] total 852 [2023-12-02 18:41:44,834 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164017555] [2023-12-02 18:41:44,834 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:41:44,837 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 853 states [2023-12-02 18:41:44,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:41:44,891 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 853 interpolants. [2023-12-02 18:41:44,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363397, Invalid=371909, Unknown=0, NotChecked=0, Total=735306 [2023-12-02 18:41:44,922 INFO L87 Difference]: Start difference. First operand 867 states and 869 transitions. Second operand has 853 states, 853 states have (on average 1.0093786635404456) internal successors, (861), 852 states have internal predecessors, (861), 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)