./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/array_2-1-simple.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 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_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/array_2-1-simple.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ef2ac183abfa5be888591001d2f7376a659c701d3e7fb64cad1cba56a829d8b3 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 01:01:40,807 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 01:01:40,928 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 01:01:40,933 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 01:01:40,934 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 01:01:40,981 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 01:01:40,982 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 01:01:40,983 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 01:01:40,984 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 01:01:40,989 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 01:01:40,989 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 01:01:40,990 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 01:01:40,991 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 01:01:40,993 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 01:01:40,993 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 01:01:40,993 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 01:01:40,994 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 01:01:40,994 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 01:01:40,995 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 01:01:40,995 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 01:01:40,996 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 01:01:40,996 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 01:01:40,997 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 01:01:40,998 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 01:01:40,998 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 01:01:40,998 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 01:01:40,999 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 01:01:40,999 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 01:01:41,000 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 01:01:41,000 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 01:01:41,001 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 01:01:41,002 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 01:01:41,002 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 01:01:41,002 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 01:01:41,002 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 01:01:41,003 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 01:01:41,003 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 01:01:41,003 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 01:01:41,003 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 01:01:41,004 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 01:01:41,004 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 01:01:41,004 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 01:01:41,005 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 01:01:41,005 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 01:01:41,006 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 01:01:41,006 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_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ef2ac183abfa5be888591001d2f7376a659c701d3e7fb64cad1cba56a829d8b3 [2023-11-12 01:01:41,299 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 01:01:41,322 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 01:01:41,324 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 01:01:41,326 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 01:01:41,326 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 01:01:41,328 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/loop-acceleration/array_2-1-simple.i [2023-11-12 01:01:44,381 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 01:01:44,648 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 01:01:44,649 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/sv-benchmarks/c/loop-acceleration/array_2-1-simple.i [2023-11-12 01:01:44,657 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/data/401a8e688/b3b3df4296a5447e98d15309da53cbf8/FLAG937a410a9 [2023-11-12 01:01:44,671 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/data/401a8e688/b3b3df4296a5447e98d15309da53cbf8 [2023-11-12 01:01:44,674 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 01:01:44,675 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 01:01:44,677 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 01:01:44,677 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 01:01:44,684 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 01:01:44,685 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 01:01:44" (1/1) ... [2023-11-12 01:01:44,687 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6b06daa7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:01:44, skipping insertion in model container [2023-11-12 01:01:44,687 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 01:01:44" (1/1) ... [2023-11-12 01:01:44,710 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 01:01:44,895 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_adeff8c1-c711-44e6-924a-c230bc29d053/sv-benchmarks/c/loop-acceleration/array_2-1-simple.i[809,822] [2023-11-12 01:01:44,912 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 01:01:44,923 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 01:01:44,936 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_adeff8c1-c711-44e6-924a-c230bc29d053/sv-benchmarks/c/loop-acceleration/array_2-1-simple.i[809,822] [2023-11-12 01:01:44,943 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 01:01:44,959 INFO L206 MainTranslator]: Completed translation [2023-11-12 01:01:44,960 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:01:44 WrapperNode [2023-11-12 01:01:44,960 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 01:01:44,961 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 01:01:44,961 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 01:01:44,962 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 01:01:44,970 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:01:44" (1/1) ... [2023-11-12 01:01:44,980 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:01:44" (1/1) ... [2023-11-12 01:01:44,997 INFO L138 Inliner]: procedures = 16, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 43 [2023-11-12 01:01:44,998 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 01:01:44,999 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 01:01:44,999 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 01:01:44,999 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 01:01:45,007 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:01:44" (1/1) ... [2023-11-12 01:01:45,008 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:01:44" (1/1) ... [2023-11-12 01:01:45,010 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:01:44" (1/1) ... [2023-11-12 01:01:45,010 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:01:44" (1/1) ... [2023-11-12 01:01:45,015 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:01:44" (1/1) ... [2023-11-12 01:01:45,018 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:01:44" (1/1) ... [2023-11-12 01:01:45,019 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:01:44" (1/1) ... [2023-11-12 01:01:45,021 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:01:44" (1/1) ... [2023-11-12 01:01:45,023 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 01:01:45,024 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 01:01:45,024 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 01:01:45,024 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 01:01:45,025 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:01:44" (1/1) ... [2023-11-12 01:01:45,032 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 01:01:45,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:01:45,068 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 01:01:45,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 01:01:45,111 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 01:01:45,111 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 01:01:45,112 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2023-11-12 01:01:45,112 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 01:01:45,112 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 01:01:45,113 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 01:01:45,114 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 01:01:45,115 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 01:01:45,115 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 01:01:45,184 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 01:01:45,186 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 01:01:45,298 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 01:01:45,359 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 01:01:45,359 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-12 01:01:45,362 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 01:01:45 BoogieIcfgContainer [2023-11-12 01:01:45,363 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 01:01:45,377 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 01:01:45,377 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 01:01:45,391 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 01:01:45,391 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 01:01:44" (1/3) ... [2023-11-12 01:01:45,392 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12612a98 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 01:01:45, skipping insertion in model container [2023-11-12 01:01:45,392 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 01:01:44" (2/3) ... [2023-11-12 01:01:45,393 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12612a98 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 01:01:45, skipping insertion in model container [2023-11-12 01:01:45,393 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 01:01:45" (3/3) ... [2023-11-12 01:01:45,395 INFO L112 eAbstractionObserver]: Analyzing ICFG array_2-1-simple.i [2023-11-12 01:01:45,416 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 01:01:45,416 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 01:01:45,472 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 01:01:45,479 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;@48960f06, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 01:01:45,479 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 01:01:45,483 INFO L276 IsEmpty]: Start isEmpty. Operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:01:45,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-12 01:01:45,488 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:01:45,489 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-12 01:01:45,489 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:01:45,494 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:01:45,494 INFO L85 PathProgramCache]: Analyzing trace with hash 1941830, now seen corresponding path program 1 times [2023-11-12 01:01:45,502 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:01:45,502 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [544878629] [2023-11-12 01:01:45,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:01:45,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:01:45,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:01:45,731 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:01:45,732 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:01:45,733 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [544878629] [2023-11-12 01:01:45,733 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [544878629] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 01:01:45,734 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 01:01:45,734 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 01:01:45,736 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367453202] [2023-11-12 01:01:45,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 01:01:45,741 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 01:01:45,742 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:01:45,772 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 01:01:45,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 01:01:45,775 INFO L87 Difference]: Start difference. First operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:01:45,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:01:45,807 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2023-11-12 01:01:45,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 01:01:45,811 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-12 01:01:45,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:01:45,834 INFO L225 Difference]: With dead ends: 13 [2023-11-12 01:01:45,835 INFO L226 Difference]: Without dead ends: 6 [2023-11-12 01:01:45,838 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 [2023-11-12 01:01:45,842 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 01:01:45,853 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 01:01:45,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2023-11-12 01:01:45,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2023-11-12 01:01:45,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:01:45,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2023-11-12 01:01:45,898 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2023-11-12 01:01:45,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:01:45,899 INFO L495 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2023-11-12 01:01:45,899 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:01:45,900 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2023-11-12 01:01:45,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-12 01:01:45,900 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:01:45,901 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-12 01:01:45,901 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 01:01:45,901 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:01:45,902 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:01:45,902 INFO L85 PathProgramCache]: Analyzing trace with hash 60064071, now seen corresponding path program 1 times [2023-11-12 01:01:45,903 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:01:45,904 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953447192] [2023-11-12 01:01:45,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:01:45,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:01:45,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:01:46,066 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:01:46,066 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:01:46,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953447192] [2023-11-12 01:01:46,067 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [953447192] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:01:46,067 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621517784] [2023-11-12 01:01:46,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:01:46,068 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:01:46,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:01:46,071 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:01:46,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 01:01:46,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:01:46,176 INFO L262 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 01:01:46,182 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:01:46,237 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:01:46,238 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:01:46,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:01:46,263 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621517784] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:01:46,263 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1825980055] [2023-11-12 01:01:46,286 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-12 01:01:46,287 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:01:46,291 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:01:46,297 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:01:46,298 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:01:46,898 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:01:47,061 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '67#(and (<= 1 |#StackHeapBarrier|) (<= 2048 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 4096)) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#B~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) (= |ULTIMATE.start_main_~#B~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem4#1| (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) 4096)))' at error location [2023-11-12 01:01:47,062 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:01:47,062 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:01:47,062 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-12 01:01:47,064 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944256157] [2023-11-12 01:01:47,065 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 01:01:47,065 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 01:01:47,066 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:01:47,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 01:01:47,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2023-11-12 01:01:47,068 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:01:47,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:01:47,099 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2023-11-12 01:01:47,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 01:01:47,099 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-12 01:01:47,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:01:47,100 INFO L225 Difference]: With dead ends: 12 [2023-11-12 01:01:47,100 INFO L226 Difference]: Without dead ends: 9 [2023-11-12 01:01:47,101 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2023-11-12 01:01:47,104 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 01:01:47,105 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 01:01:47,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2023-11-12 01:01:47,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2023-11-12 01:01:47,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:01:47,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2023-11-12 01:01:47,114 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2023-11-12 01:01:47,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:01:47,114 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2023-11-12 01:01:47,115 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:01:47,115 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2023-11-12 01:01:47,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-12 01:01:47,116 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:01:47,116 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2023-11-12 01:01:47,127 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 01:01:47,323 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:01:47,323 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:01:47,324 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:01:47,324 INFO L85 PathProgramCache]: Analyzing trace with hash -1764353658, now seen corresponding path program 2 times [2023-11-12 01:01:47,324 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:01:47,325 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315794135] [2023-11-12 01:01:47,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:01:47,325 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:01:47,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:01:47,466 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:01:47,467 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:01:47,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315794135] [2023-11-12 01:01:47,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [315794135] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:01:47,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [691852144] [2023-11-12 01:01:47,468 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 01:01:47,468 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:01:47,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:01:47,470 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:01:47,496 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 01:01:47,557 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-12 01:01:47,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 01:01:47,560 INFO L262 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-12 01:01:47,562 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:01:47,585 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:01:47,585 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:01:47,667 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:01:47,668 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [691852144] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:01:47,668 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [291626071] [2023-11-12 01:01:47,672 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-12 01:01:47,672 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:01:47,673 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:01:47,673 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:01:47,673 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:01:47,951 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:01:48,067 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '156#(and (<= 1 |#StackHeapBarrier|) (<= 2048 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 4096)) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#B~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) (= |ULTIMATE.start_main_~#B~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem4#1| (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) 4096)))' at error location [2023-11-12 01:01:48,067 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:01:48,067 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:01:48,068 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-11-12 01:01:48,068 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032162124] [2023-11-12 01:01:48,068 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 01:01:48,069 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-12 01:01:48,069 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:01:48,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-12 01:01:48,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2023-11-12 01:01:48,070 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:01:48,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:01:48,098 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2023-11-12 01:01:48,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-12 01:01:48,099 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-12 01:01:48,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:01:48,099 INFO L225 Difference]: With dead ends: 18 [2023-11-12 01:01:48,099 INFO L226 Difference]: Without dead ends: 15 [2023-11-12 01:01:48,100 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2023-11-12 01:01:48,101 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 01:01:48,102 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 01:01:48,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-12 01:01:48,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-12 01:01:48,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:01:48,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2023-11-12 01:01:48,107 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 8 [2023-11-12 01:01:48,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:01:48,108 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2023-11-12 01:01:48,108 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:01:48,108 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2023-11-12 01:01:48,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-12 01:01:48,109 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:01:48,109 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1] [2023-11-12 01:01:48,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 01:01:48,315 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-11-12 01:01:48,315 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:01:48,315 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:01:48,316 INFO L85 PathProgramCache]: Analyzing trace with hash 193090022, now seen corresponding path program 3 times [2023-11-12 01:01:48,316 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:01:48,316 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761734987] [2023-11-12 01:01:48,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:01:48,316 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:01:48,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:01:48,665 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:01:48,665 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:01:48,665 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761734987] [2023-11-12 01:01:48,665 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1761734987] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:01:48,665 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [962717892] [2023-11-12 01:01:48,666 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 01:01:48,666 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:01:48,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:01:48,667 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:01:48,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 01:01:48,762 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 01:01:48,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 01:01:48,764 INFO L262 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-12 01:01:48,768 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:01:48,803 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:01:48,803 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:01:49,078 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:01:49,079 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [962717892] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:01:49,079 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [805956321] [2023-11-12 01:01:49,082 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-12 01:01:49,082 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:01:49,082 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:01:49,083 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:01:49,083 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:01:49,267 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:01:49,427 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '317#(and (<= 1 |#StackHeapBarrier|) (<= 2048 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 4096)) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#B~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) (= |ULTIMATE.start_main_~#B~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem4#1| (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) 4096)))' at error location [2023-11-12 01:01:49,427 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:01:49,428 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:01:49,428 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2023-11-12 01:01:49,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547152577] [2023-11-12 01:01:49,428 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 01:01:49,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-12 01:01:49,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:01:49,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-12 01:01:49,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2023-11-12 01:01:49,433 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:01:49,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:01:49,489 INFO L93 Difference]: Finished difference Result 30 states and 41 transitions. [2023-11-12 01:01:49,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-12 01:01:49,490 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-12 01:01:49,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:01:49,491 INFO L225 Difference]: With dead ends: 30 [2023-11-12 01:01:49,491 INFO L226 Difference]: Without dead ends: 27 [2023-11-12 01:01:49,492 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2023-11-12 01:01:49,498 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 01:01:49,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 01:01:49,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-12 01:01:49,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-11-12 01:01:49,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:01:49,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2023-11-12 01:01:49,511 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 14 [2023-11-12 01:01:49,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:01:49,512 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2023-11-12 01:01:49,512 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:01:49,514 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2023-11-12 01:01:49,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-12 01:01:49,517 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:01:49,517 INFO L195 NwaCegarLoop]: trace histogram [22, 1, 1, 1, 1] [2023-11-12 01:01:49,527 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 01:01:49,727 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:01:49,728 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:01:49,728 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:01:49,728 INFO L85 PathProgramCache]: Analyzing trace with hash 1874160294, now seen corresponding path program 4 times [2023-11-12 01:01:49,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:01:49,728 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772645072] [2023-11-12 01:01:49,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:01:49,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:01:49,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:01:50,437 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:01:50,437 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:01:50,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772645072] [2023-11-12 01:01:50,437 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1772645072] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:01:50,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473595831] [2023-11-12 01:01:50,437 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 01:01:50,438 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:01:50,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:01:50,439 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:01:50,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 01:01:50,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:01:50,567 INFO L262 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-12 01:01:50,571 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:01:50,634 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:01:50,634 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:01:51,533 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:01:51,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473595831] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:01:51,533 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1699979102] [2023-11-12 01:01:51,535 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-12 01:01:51,535 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:01:51,536 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:01:51,536 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:01:51,536 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:01:51,668 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:01:51,834 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '622#(and (<= 1 |#StackHeapBarrier|) (<= 2048 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 4096)) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#B~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) (= |ULTIMATE.start_main_~#B~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem4#1| (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) 4096)))' at error location [2023-11-12 01:01:51,834 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:01:51,835 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:01:51,835 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2023-11-12 01:01:51,835 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333883215] [2023-11-12 01:01:51,835 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 01:01:51,837 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-11-12 01:01:51,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:01:51,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-11-12 01:01:51,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1185, Invalid=1467, Unknown=0, NotChecked=0, Total=2652 [2023-11-12 01:01:51,843 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:01:51,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:01:51,942 INFO L93 Difference]: Finished difference Result 54 states and 77 transitions. [2023-11-12 01:01:51,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-11-12 01:01:51,942 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2023-11-12 01:01:51,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:01:51,944 INFO L225 Difference]: With dead ends: 54 [2023-11-12 01:01:51,944 INFO L226 Difference]: Without dead ends: 51 [2023-11-12 01:01:51,946 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1185, Invalid=1467, Unknown=0, NotChecked=0, Total=2652 [2023-11-12 01:01:51,947 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:01:51,947 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:01:51,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2023-11-12 01:01:51,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2023-11-12 01:01:51,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:01:51,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2023-11-12 01:01:51,961 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 26 [2023-11-12 01:01:51,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:01:51,961 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2023-11-12 01:01:51,962 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:01:51,962 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2023-11-12 01:01:51,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-12 01:01:51,965 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:01:51,965 INFO L195 NwaCegarLoop]: trace histogram [46, 1, 1, 1, 1] [2023-11-12 01:01:51,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 01:01:52,171 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:01:52,172 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:01:52,172 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:01:52,172 INFO L85 PathProgramCache]: Analyzing trace with hash -1326564314, now seen corresponding path program 5 times [2023-11-12 01:01:52,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:01:52,172 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263069149] [2023-11-12 01:01:52,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:01:52,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:01:52,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:01:54,574 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:01:54,574 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:01:54,574 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263069149] [2023-11-12 01:01:54,574 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1263069149] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:01:54,574 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [429759794] [2023-11-12 01:01:54,574 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 01:01:54,575 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:01:54,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:01:54,579 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:01:54,602 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 01:01:56,535 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2023-11-12 01:01:56,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 01:01:56,542 INFO L262 TraceCheckSpWp]: Trace formula consists of 474 conjuncts, 48 conjunts are in the unsatisfiable core [2023-11-12 01:01:56,547 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:01:56,667 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:01:56,667 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:02:00,204 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:00,205 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [429759794] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:02:00,205 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1122318954] [2023-11-12 01:02:00,207 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-12 01:02:00,207 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:02:00,207 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:02:00,207 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:02:00,208 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:02:00,400 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:02:00,640 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1215#(and (<= 1 |#StackHeapBarrier|) (<= 2048 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 4096)) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#B~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) (= |ULTIMATE.start_main_~#B~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem4#1| (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) 4096)))' at error location [2023-11-12 01:02:00,640 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:02:00,641 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:02:00,641 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 96 [2023-11-12 01:02:00,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367486069] [2023-11-12 01:02:00,641 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 01:02:00,642 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2023-11-12 01:02:00,642 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:00,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2023-11-12 01:02:00,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4665, Invalid=5235, Unknown=0, NotChecked=0, Total=9900 [2023-11-12 01:02:00,651 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:00,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:00,898 INFO L93 Difference]: Finished difference Result 102 states and 149 transitions. [2023-11-12 01:02:00,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2023-11-12 01:02:00,899 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2023-11-12 01:02:00,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:00,906 INFO L225 Difference]: With dead ends: 102 [2023-11-12 01:02:00,906 INFO L226 Difference]: Without dead ends: 99 [2023-11-12 01:02:00,911 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=4665, Invalid=5235, Unknown=0, NotChecked=0, Total=9900 [2023-11-12 01:02:00,913 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:00,913 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 01:02:00,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-11-12 01:02:00,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2023-11-12 01:02:00,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.010204081632653) internal successors, (99), 98 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:00,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2023-11-12 01:02:00,948 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 50 [2023-11-12 01:02:00,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:00,948 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2023-11-12 01:02:00,948 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:00,949 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2023-11-12 01:02:00,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2023-11-12 01:02:00,955 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:00,957 INFO L195 NwaCegarLoop]: trace histogram [94, 1, 1, 1, 1] [2023-11-12 01:02:00,972 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-11-12 01:02:01,166 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:01,167 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:02:01,167 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:01,167 INFO L85 PathProgramCache]: Analyzing trace with hash 1575640870, now seen corresponding path program 6 times [2023-11-12 01:02:01,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:01,167 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969670164] [2023-11-12 01:02:01,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:01,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:01,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 01:02:08,610 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:08,611 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 01:02:08,611 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969670164] [2023-11-12 01:02:08,611 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1969670164] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 01:02:08,611 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [987209768] [2023-11-12 01:02:08,611 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 01:02:08,612 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 01:02:08,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 01:02:08,615 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 01:02:08,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 01:02:08,913 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 01:02:08,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 01:02:08,919 INFO L262 TraceCheckSpWp]: Trace formula consists of 906 conjuncts, 96 conjunts are in the unsatisfiable core [2023-11-12 01:02:08,928 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 01:02:09,161 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:09,161 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 01:02:20,711 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 01:02:20,711 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [987209768] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 01:02:20,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1574689473] [2023-11-12 01:02:20,714 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-12 01:02:20,714 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 01:02:20,714 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 01:02:20,715 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 01:02:20,715 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 01:02:20,882 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 01:02:21,228 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2384#(and (<= 1 |#StackHeapBarrier|) (<= 2048 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 4096)) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#B~0#1.base|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) (= |ULTIMATE.start_main_~#B~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem4#1| (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) 4096)))' at error location [2023-11-12 01:02:21,228 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 01:02:21,229 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 01:02:21,229 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 192 [2023-11-12 01:02:21,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872733635] [2023-11-12 01:02:21,229 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 01:02:21,231 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2023-11-12 01:02:21,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 01:02:21,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2023-11-12 01:02:21,254 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18537, Invalid=19683, Unknown=0, NotChecked=0, Total=38220 [2023-11-12 01:02:21,254 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand has 193 states, 193 states have (on average 1.0155440414507773) internal successors, (196), 192 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:21,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 01:02:21,900 INFO L93 Difference]: Finished difference Result 198 states and 293 transitions. [2023-11-12 01:02:21,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2023-11-12 01:02:21,907 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 1.0155440414507773) internal successors, (196), 192 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 98 [2023-11-12 01:02:21,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 01:02:21,914 INFO L225 Difference]: With dead ends: 198 [2023-11-12 01:02:21,914 INFO L226 Difference]: Without dead ends: 195 [2023-11-12 01:02:21,920 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1231 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=18537, Invalid=19683, Unknown=0, NotChecked=0, Total=38220 [2023-11-12 01:02:21,922 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 01:02:21,922 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 01:02:21,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2023-11-12 01:02:21,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 195. [2023-11-12 01:02:21,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 194 states have (on average 1.0051546391752577) internal successors, (195), 194 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:21,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2023-11-12 01:02:21,957 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 98 [2023-11-12 01:02:21,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 01:02:21,958 INFO L495 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2023-11-12 01:02:21,959 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 1.0155440414507773) internal successors, (196), 192 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 01:02:21,959 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2023-11-12 01:02:21,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2023-11-12 01:02:21,962 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 01:02:21,962 INFO L195 NwaCegarLoop]: trace histogram [190, 1, 1, 1, 1] [2023-11-12 01:02:21,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 01:02:22,166 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adeff8c1-c711-44e6-924a-c230bc29d053/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-12 01:02:22,167 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 01:02:22,168 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 01:02:22,168 INFO L85 PathProgramCache]: Analyzing trace with hash 1544332582, now seen corresponding path program 7 times [2023-11-12 01:02:22,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 01:02:22,168 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190053458] [2023-11-12 01:02:22,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 01:02:22,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 01:02:22,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat