./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/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_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/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_150e5ec1-76d4-468e-95e7-8bc7846d2f14/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 538775af36be57be36a6cd470d0ff7a3d7714753249a7d4cb9a7b907cdacda78 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 18:36:14,645 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 18:36:14,750 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 18:36:14,757 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 18:36:14,757 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 18:36:14,782 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 18:36:14,782 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 18:36:14,783 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 18:36:14,784 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 18:36:14,784 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 18:36:14,785 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 18:36:14,785 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 18:36:14,786 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 18:36:14,787 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 18:36:14,787 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 18:36:14,788 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 18:36:14,788 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 18:36:14,789 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 18:36:14,789 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 18:36:14,790 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 18:36:14,790 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 18:36:14,791 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 18:36:14,791 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 18:36:14,792 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 18:36:14,792 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 18:36:14,793 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 18:36:14,793 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 18:36:14,793 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 18:36:14,794 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 18:36:14,794 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 18:36:14,795 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 18:36:14,795 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 18:36:14,795 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 18:36:14,795 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 18:36:14,796 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 18:36:14,796 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 18:36:14,796 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 18:36:14,796 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 18:36:14,797 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 18:36:14,797 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 18:36:14,797 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 18:36:14,797 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 18:36:14,798 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 18:36:14,798 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 18:36:14,798 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 18:36:14,798 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 18:36:14,798 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 18:36:14,799 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_150e5ec1-76d4-468e-95e7-8bc7846d2f14/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 538775af36be57be36a6cd470d0ff7a3d7714753249a7d4cb9a7b907cdacda78 [2023-12-02 18:36:15,055 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 18:36:15,078 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 18:36:15,081 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 18:36:15,082 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 18:36:15,083 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 18:36:15,084 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c [2023-12-02 18:36:17,942 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 18:36:18,109 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 18:36:18,110 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c [2023-12-02 18:36:18,116 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/data/0a7d55700/5c540b478578471483366b77190226ca/FLAG982888f73 [2023-12-02 18:36:18,129 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/data/0a7d55700/5c540b478578471483366b77190226ca [2023-12-02 18:36:18,131 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 18:36:18,132 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 18:36:18,133 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 18:36:18,133 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 18:36:18,138 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 18:36:18,138 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 06:36:18" (1/1) ... [2023-12-02 18:36:18,139 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b87e0cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:36:18, skipping insertion in model container [2023-12-02 18:36:18,139 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 06:36:18" (1/1) ... [2023-12-02 18:36:18,158 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 18:36:18,292 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_150e5ec1-76d4-468e-95e7-8bc7846d2f14/sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c[319,332] [2023-12-02 18:36:18,305 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 18:36:18,314 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 18:36:18,325 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_150e5ec1-76d4-468e-95e7-8bc7846d2f14/sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c[319,332] [2023-12-02 18:36:18,329 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 18:36:18,344 INFO L206 MainTranslator]: Completed translation [2023-12-02 18:36:18,345 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:36:18 WrapperNode [2023-12-02 18:36:18,345 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 18:36:18,346 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 18:36:18,346 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 18:36:18,346 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 18:36:18,359 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:36:18" (1/1) ... [2023-12-02 18:36:18,365 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:36:18" (1/1) ... [2023-12-02 18:36:18,379 INFO L138 Inliner]: procedures = 12, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 42 [2023-12-02 18:36:18,380 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 18:36:18,380 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 18:36:18,380 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 18:36:18,380 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 18:36:18,395 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:36:18" (1/1) ... [2023-12-02 18:36:18,395 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:36:18" (1/1) ... [2023-12-02 18:36:18,396 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:36:18" (1/1) ... [2023-12-02 18:36:18,396 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:36:18" (1/1) ... [2023-12-02 18:36:18,399 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:36:18" (1/1) ... [2023-12-02 18:36:18,401 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:36:18" (1/1) ... [2023-12-02 18:36:18,402 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:36:18" (1/1) ... [2023-12-02 18:36:18,403 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:36:18" (1/1) ... [2023-12-02 18:36:18,405 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 18:36:18,405 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 18:36:18,405 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 18:36:18,406 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 18:36:18,406 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:36:18" (1/1) ... [2023-12-02 18:36:18,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 18:36:18,434 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:36:18,446 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 18:36:18,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 18:36:18,487 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 18:36:18,487 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 18:36:18,487 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 18:36:18,488 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 18:36:18,488 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-12-02 18:36:18,488 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-12-02 18:36:18,571 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 18:36:18,573 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 18:36:18,702 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 18:36:18,741 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 18:36:18,741 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-12-02 18:36:18,743 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 06:36:18 BoogieIcfgContainer [2023-12-02 18:36:18,743 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 18:36:18,746 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 18:36:18,746 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 18:36:18,750 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 18:36:18,751 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 06:36:18" (1/3) ... [2023-12-02 18:36:18,752 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5929c655 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 06:36:18, skipping insertion in model container [2023-12-02 18:36:18,752 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 06:36:18" (2/3) ... [2023-12-02 18:36:18,753 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5929c655 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 06:36:18, skipping insertion in model container [2023-12-02 18:36:18,753 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 06:36:18" (3/3) ... [2023-12-02 18:36:18,754 INFO L112 eAbstractionObserver]: Analyzing ICFG mono-crafted_14.c [2023-12-02 18:36:18,778 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 18:36:18,778 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 18:36:18,835 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 18:36:18,844 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;@1a9941ff, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 18:36:18,844 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 18:36:18,849 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 18:36:18,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-12-02 18:36:18,857 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:36:18,858 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:36:18,859 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:36:18,865 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:36:18,865 INFO L85 PathProgramCache]: Analyzing trace with hash -212380657, now seen corresponding path program 1 times [2023-12-02 18:36:18,877 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:36:18,877 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172761847] [2023-12-02 18:36:18,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:36:18,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:36:18,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:36:19,064 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 18:36:19,065 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:36:19,065 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172761847] [2023-12-02 18:36:19,065 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [172761847] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:36:19,066 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 18:36:19,066 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 18:36:19,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567243751] [2023-12-02 18:36:19,068 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:36:19,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 18:36:19,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:36:19,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 18:36:19,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 18:36:19,099 INFO L87 Difference]: Start difference. First operand has 13 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:19,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:36:19,135 INFO L93 Difference]: Finished difference Result 25 states and 33 transitions. [2023-12-02 18:36:19,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 18:36:19,138 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-12-02 18:36:19,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:36:19,144 INFO L225 Difference]: With dead ends: 25 [2023-12-02 18:36:19,144 INFO L226 Difference]: Without dead ends: 12 [2023-12-02 18:36:19,146 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 18:36:19,150 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 0 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:36:19,151 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 19 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 18:36:19,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-12-02 18:36:19,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-12-02 18:36:19,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 18:36:19,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2023-12-02 18:36:19,183 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 7 [2023-12-02 18:36:19,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:36:19,183 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2023-12-02 18:36:19,184 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:19,184 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2023-12-02 18:36:19,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 18:36:19,185 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:36:19,185 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:36:19,185 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 18:36:19,186 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:36:19,187 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:36:19,187 INFO L85 PathProgramCache]: Analyzing trace with hash -590153153, now seen corresponding path program 1 times [2023-12-02 18:36:19,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:36:19,188 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636674799] [2023-12-02 18:36:19,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:36:19,188 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:36:19,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:36:19,305 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:36:19,306 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:36:19,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636674799] [2023-12-02 18:36:19,306 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [636674799] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:36:19,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1162738934] [2023-12-02 18:36:19,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:36:19,307 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:36:19,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:36:19,309 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:36:19,318 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 18:36:19,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:36:19,374 INFO L262 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 18:36:19,380 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:36:19,428 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:36:19,428 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:36:19,569 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 18:36:19,570 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1162738934] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:36:19,570 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1501333447] [2023-12-02 18:36:19,594 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:36:19,594 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:36:19,598 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:36:19,603 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:36:19,604 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:36:19,836 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 18:36:19,843 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:36:19,907 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1501333447] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 18:36:19,907 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:36:19,907 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [3, 3, 3] total 11 [2023-12-02 18:36:19,909 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53466278] [2023-12-02 18:36:19,909 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 18:36:19,910 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 18:36:19,910 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:36:19,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 18:36:19,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2023-12-02 18:36:19,911 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:19,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:36:19,966 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2023-12-02 18:36:19,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 18:36:19,967 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 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 18:36:19,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:36:19,968 INFO L225 Difference]: With dead ends: 21 [2023-12-02 18:36:19,968 INFO L226 Difference]: Without dead ends: 19 [2023-12-02 18:36:19,969 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2023-12-02 18:36:19,971 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 4 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:36:19,972 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 17 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 18:36:19,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-12-02 18:36:19,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2023-12-02 18:36:19,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 18:36:19,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2023-12-02 18:36:19,980 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 8 [2023-12-02 18:36:19,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:36:19,981 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2023-12-02 18:36:19,981 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 5 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:19,981 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2023-12-02 18:36:19,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 18:36:19,982 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:36:19,983 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:36:19,989 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 18:36:20,184 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:36:20,185 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:36:20,185 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:36:20,185 INFO L85 PathProgramCache]: Analyzing trace with hash -1992822231, now seen corresponding path program 1 times [2023-12-02 18:36:20,186 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:36:20,186 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [357714181] [2023-12-02 18:36:20,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:36:20,186 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:36:20,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:36:20,262 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 18:36:20,263 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:36:20,263 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [357714181] [2023-12-02 18:36:20,263 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [357714181] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:36:20,264 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [494893288] [2023-12-02 18:36:20,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:36:20,264 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:36:20,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:36:20,266 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:36:20,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 18:36:20,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:36:20,314 INFO L262 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 18:36:20,315 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:36:20,329 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 18:36:20,329 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:36:20,391 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 18:36:20,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [494893288] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:36:20,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1866345109] [2023-12-02 18:36:20,394 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:36:20,394 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:36:20,395 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:36:20,395 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:36:20,395 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:36:20,546 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-12-02 18:36:20,566 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:36:20,703 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '239#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_2| Int)) (and (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_2|) (not (= (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_2| 2) 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 18:36:20,704 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:36:20,704 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:36:20,704 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-12-02 18:36:20,704 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114987484] [2023-12-02 18:36:20,704 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:36:20,705 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 18:36:20,705 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:36:20,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 18:36:20,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2023-12-02 18:36:20,707 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:20,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:36:20,755 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2023-12-02 18:36:20,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 18:36:20,756 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-12-02 18:36:20,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:36:20,758 INFO L225 Difference]: With dead ends: 36 [2023-12-02 18:36:20,758 INFO L226 Difference]: Without dead ends: 21 [2023-12-02 18:36:20,759 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2023-12-02 18:36:20,761 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:36:20,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 49 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 18:36:20,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-12-02 18:36:20,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-12-02 18:36:20,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 18:36:20,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2023-12-02 18:36:20,769 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 9 [2023-12-02 18:36:20,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:36:20,770 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2023-12-02 18:36:20,770 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:20,770 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2023-12-02 18:36:20,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-12-02 18:36:20,771 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:36:20,771 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:36:20,777 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 18:36:20,976 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:36:20,976 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:36:20,977 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:36:20,977 INFO L85 PathProgramCache]: Analyzing trace with hash -2005907879, now seen corresponding path program 2 times [2023-12-02 18:36:20,977 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:36:20,977 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099746742] [2023-12-02 18:36:20,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:36:20,977 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:36:20,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:36:21,152 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:36:21,152 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:36:21,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099746742] [2023-12-02 18:36:21,153 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2099746742] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:36:21,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [894893601] [2023-12-02 18:36:21,153 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 18:36:21,153 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:36:21,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:36:21,155 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:36:21,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 18:36:21,209 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 18:36:21,209 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 18:36:21,210 INFO L262 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 18:36:21,212 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:36:21,233 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:36:21,233 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:36:21,400 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:36:21,401 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [894893601] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:36:21,401 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1370482464] [2023-12-02 18:36:21,403 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:36:21,403 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:36:21,404 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:36:21,404 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:36:21,404 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:36:21,520 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-12-02 18:36:21,538 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:36:21,673 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '412#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_3| Int)) (and (not (= (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_3| 2) 0)) (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_3|))))' at error location [2023-12-02 18:36:21,673 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:36:21,673 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:36:21,674 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-12-02 18:36:21,674 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868925552] [2023-12-02 18:36:21,674 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:36:21,675 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 18:36:21,675 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:36:21,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 18:36:21,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=247, Unknown=0, NotChecked=0, Total=342 [2023-12-02 18:36:21,677 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:21,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:36:21,715 INFO L93 Difference]: Finished difference Result 42 states and 53 transitions. [2023-12-02 18:36:21,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 18:36:21,716 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-12-02 18:36:21,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:36:21,717 INFO L225 Difference]: With dead ends: 42 [2023-12-02 18:36:21,717 INFO L226 Difference]: Without dead ends: 27 [2023-12-02 18:36:21,718 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=95, Invalid=247, Unknown=0, NotChecked=0, Total=342 [2023-12-02 18:36:21,720 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:36:21,720 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 17 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 18:36:21,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-12-02 18:36:21,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-12-02 18:36:21,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 23 states have internal predecessors, (25), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 18:36:21,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2023-12-02 18:36:21,729 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 12 [2023-12-02 18:36:21,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:36:21,729 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2023-12-02 18:36:21,730 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:21,730 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2023-12-02 18:36:21,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-12-02 18:36:21,731 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:36:21,731 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:36:21,737 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 18:36:21,936 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:36:21,937 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:36:21,937 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:36:21,938 INFO L85 PathProgramCache]: Analyzing trace with hash -263080871, now seen corresponding path program 3 times [2023-12-02 18:36:21,938 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:36:21,938 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [66790854] [2023-12-02 18:36:21,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:36:21,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:36:21,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:36:22,356 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:36:22,356 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:36:22,356 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [66790854] [2023-12-02 18:36:22,356 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [66790854] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:36:22,357 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1307042458] [2023-12-02 18:36:22,357 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 18:36:22,357 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:36:22,357 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:36:22,358 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:36:22,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 18:36:22,420 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 18:36:22,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 18:36:22,421 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 18:36:22,424 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:36:22,471 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:36:22,471 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:36:22,998 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:36:22,998 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1307042458] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:36:22,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [333760411] [2023-12-02 18:36:23,000 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:36:23,001 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:36:23,001 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:36:23,001 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:36:23,001 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:36:23,079 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-12-02 18:36:23,091 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:36:23,237 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '657#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_4| Int)) (and (not (= (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_4| 2) 0)) (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_4|))))' at error location [2023-12-02 18:36:23,237 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:36:23,238 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:36:23,238 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2023-12-02 18:36:23,238 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919808428] [2023-12-02 18:36:23,238 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:36:23,239 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-12-02 18:36:23,239 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:36:23,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-12-02 18:36:23,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=613, Unknown=0, NotChecked=0, Total=930 [2023-12-02 18:36:23,241 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 25 states, 25 states have (on average 1.24) internal successors, (31), 24 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:23,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:36:23,291 INFO L93 Difference]: Finished difference Result 54 states and 71 transitions. [2023-12-02 18:36:23,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-12-02 18:36:23,293 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.24) internal successors, (31), 24 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-12-02 18:36:23,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:36:23,295 INFO L225 Difference]: With dead ends: 54 [2023-12-02 18:36:23,295 INFO L226 Difference]: Without dead ends: 39 [2023-12-02 18:36:23,296 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=317, Invalid=613, Unknown=0, NotChecked=0, Total=930 [2023-12-02 18:36:23,297 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 18:36:23,297 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 25 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 18:36:23,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-12-02 18:36:23,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2023-12-02 18:36:23,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 33 states have (on average 1.121212121212121) internal successors, (37), 35 states have internal predecessors, (37), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 18:36:23,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2023-12-02 18:36:23,306 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 18 [2023-12-02 18:36:23,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:36:23,307 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2023-12-02 18:36:23,307 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.24) internal successors, (31), 24 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:23,307 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2023-12-02 18:36:23,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-12-02 18:36:23,308 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:36:23,308 INFO L195 NwaCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:36:23,314 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 18:36:23,514 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:36:23,514 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:36:23,514 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:36:23,514 INFO L85 PathProgramCache]: Analyzing trace with hash 68489305, now seen corresponding path program 4 times [2023-12-02 18:36:23,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:36:23,515 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1513649341] [2023-12-02 18:36:23,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:36:23,515 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:36:23,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:36:24,565 INFO L134 CoverageAnalysis]: Checked inductivity of 254 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:36:24,565 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:36:24,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1513649341] [2023-12-02 18:36:24,566 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1513649341] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:36:24,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1537409540] [2023-12-02 18:36:24,566 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 18:36:24,566 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:36:24,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:36:24,568 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:36:24,570 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 18:36:24,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:36:24,636 INFO L262 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 24 conjunts are in the unsatisfiable core [2023-12-02 18:36:24,641 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:36:24,708 INFO L134 CoverageAnalysis]: Checked inductivity of 254 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:36:24,709 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:36:25,992 INFO L134 CoverageAnalysis]: Checked inductivity of 254 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:36:25,992 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1537409540] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:36:25,992 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1312776176] [2023-12-02 18:36:25,995 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:36:25,995 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:36:25,995 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:36:25,995 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:36:25,995 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:36:26,075 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-12-02 18:36:26,086 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:36:26,267 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1046#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_5| Int)) (and (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_5|) (not (= (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_5| 2) 0)))))' at error location [2023-12-02 18:36:26,267 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:36:26,268 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:36:26,268 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2023-12-02 18:36:26,268 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320229515] [2023-12-02 18:36:26,268 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:36:26,269 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-12-02 18:36:26,269 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:36:26,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-12-02 18:36:26,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1193, Invalid=1777, Unknown=0, NotChecked=0, Total=2970 [2023-12-02 18:36:26,273 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand has 49 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 48 states have internal predecessors, (55), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:26,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:36:26,360 INFO L93 Difference]: Finished difference Result 78 states and 107 transitions. [2023-12-02 18:36:26,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-12-02 18:36:26,361 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 48 states have internal predecessors, (55), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2023-12-02 18:36:26,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:36:26,362 INFO L225 Difference]: With dead ends: 78 [2023-12-02 18:36:26,363 INFO L226 Difference]: Without dead ends: 63 [2023-12-02 18:36:26,364 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 507 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1193, Invalid=1777, Unknown=0, NotChecked=0, Total=2970 [2023-12-02 18:36:26,365 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:36:26,366 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 41 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:36:26,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-12-02 18:36:26,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2023-12-02 18:36:26,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 59 states have internal predecessors, (61), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 18:36:26,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2023-12-02 18:36:26,378 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 30 [2023-12-02 18:36:26,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:36:26,379 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2023-12-02 18:36:26,379 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 48 states have internal predecessors, (55), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:26,379 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2023-12-02 18:36:26,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-12-02 18:36:26,381 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:36:26,381 INFO L195 NwaCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:36:26,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-12-02 18:36:26,587 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-12-02 18:36:26,588 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:36:26,588 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:36:26,588 INFO L85 PathProgramCache]: Analyzing trace with hash -1206007719, now seen corresponding path program 5 times [2023-12-02 18:36:26,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:36:26,588 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [240997010] [2023-12-02 18:36:26,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:36:26,588 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:36:26,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:36:29,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1082 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:36:29,885 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:36:29,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [240997010] [2023-12-02 18:36:29,886 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [240997010] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:36:29,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1393514036] [2023-12-02 18:36:29,886 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 18:36:29,886 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:36:29,886 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:36:29,887 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:36:29,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 18:36:30,011 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2023-12-02 18:36:30,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 18:36:30,014 INFO L262 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 48 conjunts are in the unsatisfiable core [2023-12-02 18:36:30,023 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:36:30,137 INFO L134 CoverageAnalysis]: Checked inductivity of 1082 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:36:30,137 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:36:33,391 INFO L134 CoverageAnalysis]: Checked inductivity of 1082 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:36:33,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1393514036] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:36:33,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [947717380] [2023-12-02 18:36:33,393 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:36:33,393 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:36:33,394 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:36:33,394 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:36:33,394 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:36:33,447 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-12-02 18:36:33,457 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:36:33,709 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1723#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_6| Int)) (and (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_6|) (not (= (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_6| 2) 0)))))' at error location [2023-12-02 18:36:33,709 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:36:33,709 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:36:33,709 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 96 [2023-12-02 18:36:33,709 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010713647] [2023-12-02 18:36:33,710 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:36:33,710 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2023-12-02 18:36:33,711 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:36:33,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2023-12-02 18:36:33,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4673, Invalid=5833, Unknown=0, NotChecked=0, Total=10506 [2023-12-02 18:36:33,716 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand has 97 states, 97 states have (on average 1.0618556701030928) internal successors, (103), 96 states have internal predecessors, (103), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:33,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:36:33,916 INFO L93 Difference]: Finished difference Result 126 states and 179 transitions. [2023-12-02 18:36:33,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2023-12-02 18:36:33,917 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.0618556701030928) internal successors, (103), 96 states have internal predecessors, (103), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2023-12-02 18:36:33,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:36:33,919 INFO L225 Difference]: With dead ends: 126 [2023-12-02 18:36:33,919 INFO L226 Difference]: Without dead ends: 111 [2023-12-02 18:36:33,923 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1035 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4673, Invalid=5833, Unknown=0, NotChecked=0, Total=10506 [2023-12-02 18:36:33,924 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 18:36:33,925 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 57 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 18:36:33,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2023-12-02 18:36:33,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2023-12-02 18:36:33,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 105 states have (on average 1.0380952380952382) internal successors, (109), 107 states have internal predecessors, (109), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 18:36:33,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 114 transitions. [2023-12-02 18:36:33,952 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 114 transitions. Word has length 54 [2023-12-02 18:36:33,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:36:33,952 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 114 transitions. [2023-12-02 18:36:33,953 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.0618556701030928) internal successors, (103), 96 states have internal predecessors, (103), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:33,953 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 114 transitions. [2023-12-02 18:36:33,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2023-12-02 18:36:33,957 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:36:33,957 INFO L195 NwaCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:36:33,963 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 18:36:34,160 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:36:34,160 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:36:34,161 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:36:34,161 INFO L85 PathProgramCache]: Analyzing trace with hash -164153255, now seen corresponding path program 6 times [2023-12-02 18:36:34,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:36:34,161 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530863513] [2023-12-02 18:36:34,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:36:34,161 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:36:34,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:36:43,066 INFO L134 CoverageAnalysis]: Checked inductivity of 4466 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:36:43,066 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:36:43,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530863513] [2023-12-02 18:36:43,067 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530863513] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:36:43,067 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1821952320] [2023-12-02 18:36:43,067 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 18:36:43,067 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:36:43,067 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:36:43,068 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:36:43,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 18:36:43,182 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 18:36:43,182 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 18:36:43,186 INFO L262 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 96 conjunts are in the unsatisfiable core [2023-12-02 18:36:43,195 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:36:43,382 INFO L134 CoverageAnalysis]: Checked inductivity of 4466 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:36:43,382 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:36:53,359 INFO L134 CoverageAnalysis]: Checked inductivity of 4466 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:36:53,359 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1821952320] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:36:53,359 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1274484381] [2023-12-02 18:36:53,361 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:36:53,361 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:36:53,361 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:36:53,362 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:36:53,362 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:36:53,413 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-12-02 18:36:53,420 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:36:53,799 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2976#(and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_7| Int)) (and (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_7|) (not (= (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_7| 2) 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 18:36:53,799 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:36:53,800 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:36:53,800 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 192 [2023-12-02 18:36:53,800 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169093887] [2023-12-02 18:36:53,800 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:36:53,801 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2023-12-02 18:36:53,801 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:36:53,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2023-12-02 18:36:53,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18545, Invalid=20857, Unknown=0, NotChecked=0, Total=39402 [2023-12-02 18:36:53,815 INFO L87 Difference]: Start difference. First operand 111 states and 114 transitions. Second operand has 193 states, 193 states have (on average 1.0310880829015545) internal successors, (199), 192 states have internal predecessors, (199), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:54,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:36:54,241 INFO L93 Difference]: Finished difference Result 222 states and 323 transitions. [2023-12-02 18:36:54,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2023-12-02 18:36:54,242 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 1.0310880829015545) internal successors, (199), 192 states have internal predecessors, (199), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 102 [2023-12-02 18:36:54,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:36:54,244 INFO L225 Difference]: With dead ends: 222 [2023-12-02 18:36:54,244 INFO L226 Difference]: Without dead ends: 207 [2023-12-02 18:36:54,247 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 203 SyntacticMatches, 0 SemanticMatches, 197 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2091 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=18545, Invalid=20857, Unknown=0, NotChecked=0, Total=39402 [2023-12-02 18:36:54,248 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 18:36:54,248 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 65 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 18:36:54,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2023-12-02 18:36:54,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 207. [2023-12-02 18:36:54,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 201 states have (on average 1.0199004975124377) internal successors, (205), 203 states have internal predecessors, (205), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 18:36:54,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 210 transitions. [2023-12-02 18:36:54,268 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 210 transitions. Word has length 102 [2023-12-02 18:36:54,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:36:54,268 INFO L495 AbstractCegarLoop]: Abstraction has 207 states and 210 transitions. [2023-12-02 18:36:54,269 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 1.0310880829015545) internal successors, (199), 192 states have internal predecessors, (199), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:36:54,269 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 210 transitions. [2023-12-02 18:36:54,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2023-12-02 18:36:54,271 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:36:54,271 INFO L195 NwaCegarLoop]: trace histogram [190, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:36:54,277 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 18:36:54,472 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:36:54,472 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:36:54,473 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:36:54,473 INFO L85 PathProgramCache]: Analyzing trace with hash -360048551, now seen corresponding path program 7 times [2023-12-02 18:36:54,473 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:36:54,473 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144955512] [2023-12-02 18:36:54,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:36:54,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:36:54,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:37:27,975 INFO L134 CoverageAnalysis]: Checked inductivity of 18146 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:37:27,976 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:37:27,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144955512] [2023-12-02 18:37:27,976 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2144955512] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:37:27,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1501252375] [2023-12-02 18:37:27,976 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 18:37:27,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:37:27,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:37:27,977 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:37:27,978 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 18:37:28,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:37:28,173 INFO L262 TraceCheckSpWp]: Trace formula consists of 425 conjuncts, 192 conjunts are in the unsatisfiable core [2023-12-02 18:37:28,198 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:37:28,551 INFO L134 CoverageAnalysis]: Checked inductivity of 18146 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:37:28,552 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:38:05,251 INFO L134 CoverageAnalysis]: Checked inductivity of 18146 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:38:05,251 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1501252375] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:38:05,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [356154987] [2023-12-02 18:38:05,253 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:38:05,253 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:38:05,253 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:38:05,253 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:38:05,253 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:38:05,326 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-12-02 18:38:05,333 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:38:05,962 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5381#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_8| Int)) (and (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_8|) (not (= (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_8| 2) 0)))))' at error location [2023-12-02 18:38:05,962 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:38:05,962 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:38:05,962 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [192, 192, 192] total 384 [2023-12-02 18:38:05,963 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413923486] [2023-12-02 18:38:05,963 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:38:05,963 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 385 states [2023-12-02 18:38:05,964 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:38:05,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 385 interpolants. [2023-12-02 18:38:05,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73937, Invalid=78553, Unknown=0, NotChecked=0, Total=152490 [2023-12-02 18:38:05,994 INFO L87 Difference]: Start difference. First operand 207 states and 210 transitions. Second operand has 385 states, 385 states have (on average 1.0155844155844156) internal successors, (391), 384 states have internal predecessors, (391), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:38:07,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:38:07,939 INFO L93 Difference]: Finished difference Result 414 states and 611 transitions. [2023-12-02 18:38:07,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. [2023-12-02 18:38:07,940 INFO L78 Accepts]: Start accepts. Automaton has has 385 states, 385 states have (on average 1.0155844155844156) internal successors, (391), 384 states have internal predecessors, (391), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 198 [2023-12-02 18:38:07,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:38:07,942 INFO L225 Difference]: With dead ends: 414 [2023-12-02 18:38:07,942 INFO L226 Difference]: Without dead ends: 399 [2023-12-02 18:38:07,949 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 784 GetRequests, 395 SyntacticMatches, 0 SemanticMatches, 389 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4203 ImplicationChecksByTransitivity, 45.5s TimeCoverageRelationStatistics Valid=73937, Invalid=78553, Unknown=0, NotChecked=0, Total=152490 [2023-12-02 18:38:07,949 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 410 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 410 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 18:38:07,950 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 73 Invalid, 411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 410 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 18:38:07,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2023-12-02 18:38:07,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 399. [2023-12-02 18:38:07,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 393 states have (on average 1.0101781170483461) internal successors, (397), 395 states have internal predecessors, (397), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 18:38:07,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 402 transitions. [2023-12-02 18:38:07,991 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 402 transitions. Word has length 198 [2023-12-02 18:38:07,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:38:07,991 INFO L495 AbstractCegarLoop]: Abstraction has 399 states and 402 transitions. [2023-12-02 18:38:07,992 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 385 states, 385 states have (on average 1.0155844155844156) internal successors, (391), 384 states have internal predecessors, (391), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:38:07,992 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 402 transitions. [2023-12-02 18:38:08,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 391 [2023-12-02 18:38:08,002 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:38:08,002 INFO L195 NwaCegarLoop]: trace histogram [382, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:38:08,008 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 18:38:08,203 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:38:08,203 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:38:08,204 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:38:08,204 INFO L85 PathProgramCache]: Analyzing trace with hash -1280321447, now seen corresponding path program 8 times [2023-12-02 18:38:08,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:38:08,204 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563725982] [2023-12-02 18:38:08,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:38:08,204 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:38:09,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 18:40:50,754 INFO L134 CoverageAnalysis]: Checked inductivity of 73154 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:40:50,754 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 18:40:50,755 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563725982] [2023-12-02 18:40:50,755 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563725982] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 18:40:50,755 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [215231922] [2023-12-02 18:40:50,755 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 18:40:50,755 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 18:40:50,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 18:40:50,756 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 18:40:50,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 18:40:53,112 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 192 check-sat command(s) [2023-12-02 18:40:53,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 18:40:53,126 INFO L262 TraceCheckSpWp]: Trace formula consists of 809 conjuncts, 384 conjunts are in the unsatisfiable core [2023-12-02 18:40:53,154 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 18:40:53,769 INFO L134 CoverageAnalysis]: Checked inductivity of 73154 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:40:53,770 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 18:43:35,082 INFO L134 CoverageAnalysis]: Checked inductivity of 73154 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 18:43:35,083 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [215231922] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 18:43:35,083 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1045285626] [2023-12-02 18:43:35,084 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-12-02 18:43:35,084 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 18:43:35,085 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 18:43:35,085 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 18:43:35,085 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 18:43:35,143 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 19 for LOIs [2023-12-02 18:43:35,151 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 18:43:36,649 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10090#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_9| Int)) (and (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_9|) (not (= (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_9| 2) 0)))))' at error location [2023-12-02 18:43:36,649 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 18:43:36,650 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 18:43:36,650 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [384, 384, 384] total 768 [2023-12-02 18:43:36,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764317803] [2023-12-02 18:43:36,651 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 18:43:36,653 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 769 states [2023-12-02 18:43:36,653 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 18:43:36,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 769 interpolants. [2023-12-02 18:43:36,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=295313, Invalid=304537, Unknown=0, NotChecked=0, Total=599850 [2023-12-02 18:43:36,730 INFO L87 Difference]: Start difference. First operand 399 states and 402 transitions. Second operand has 769 states, 769 states have (on average 1.0078023407022108) internal successors, (775), 768 states have internal predecessors, (775), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:43:54,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 18:43:54,866 INFO L93 Difference]: Finished difference Result 798 states and 1187 transitions. [2023-12-02 18:43:54,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 768 states. [2023-12-02 18:43:54,868 INFO L78 Accepts]: Start accepts. Automaton has has 769 states, 769 states have (on average 1.0078023407022108) internal successors, (775), 768 states have internal predecessors, (775), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 390 [2023-12-02 18:43:54,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 18:43:54,873 INFO L225 Difference]: With dead ends: 798 [2023-12-02 18:43:54,873 INFO L226 Difference]: Without dead ends: 783 [2023-12-02 18:43:54,903 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1552 GetRequests, 779 SyntacticMatches, 0 SemanticMatches, 773 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8427 ImplicationChecksByTransitivity, 200.4s TimeCoverageRelationStatistics Valid=295313, Invalid=304537, Unknown=0, NotChecked=0, Total=599850 [2023-12-02 18:43:54,904 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 803 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 804 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 803 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-12-02 18:43:54,905 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 97 Invalid, 804 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 803 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-12-02 18:43:54,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 783 states. [2023-12-02 18:43:54,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 783 to 783. [2023-12-02 18:43:54,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 783 states, 777 states have (on average 1.005148005148005) internal successors, (781), 779 states have internal predecessors, (781), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-12-02 18:43:54,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 783 states to 783 states and 786 transitions. [2023-12-02 18:43:54,964 INFO L78 Accepts]: Start accepts. Automaton has 783 states and 786 transitions. Word has length 390 [2023-12-02 18:43:54,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 18:43:54,964 INFO L495 AbstractCegarLoop]: Abstraction has 783 states and 786 transitions. [2023-12-02 18:43:54,965 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 769 states, 769 states have (on average 1.0078023407022108) internal successors, (775), 768 states have internal predecessors, (775), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 18:43:54,966 INFO L276 IsEmpty]: Start isEmpty. Operand 783 states and 786 transitions. [2023-12-02 18:43:54,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 775 [2023-12-02 18:43:54,988 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 18:43:54,988 INFO L195 NwaCegarLoop]: trace histogram [766, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 18:43:54,997 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 18:43:55,189 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_150e5ec1-76d4-468e-95e7-8bc7846d2f14/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 18:43:55,189 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 18:43:55,189 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 18:43:55,190 INFO L85 PathProgramCache]: Analyzing trace with hash -939829159, now seen corresponding path program 9 times [2023-12-02 18:43:55,190 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 18:43:55,190 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686256895] [2023-12-02 18:43:55,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 18:43:55,190 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 18:43:56,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat