./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_two_index_08.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e7bb482b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_two_index_08.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp --witnessprinter.witness.filename witness.graphml --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 f36ecc230238464ca74f9ec244847d47641e99ef3ee219d6c3ec0ed13a7505ac --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 20:32:35,131 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 20:32:35,209 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-06 20:32:35,215 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 20:32:35,216 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 20:32:35,242 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 20:32:35,243 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 20:32:35,244 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 20:32:35,245 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 20:32:35,246 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 20:32:35,246 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 20:32:35,247 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 20:32:35,248 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 20:32:35,248 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 20:32:35,249 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 20:32:35,249 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 20:32:35,250 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 20:32:35,251 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 20:32:35,251 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 20:32:35,252 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 20:32:35,253 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 20:32:35,254 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 20:32:35,255 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 20:32:35,255 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-06 20:32:35,256 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 20:32:35,256 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 20:32:35,257 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 20:32:35,257 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 20:32:35,258 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-06 20:32:35,258 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 20:32:35,259 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-06 20:32:35,259 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 20:32:35,260 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-06 20:32:35,260 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 20:32:35,260 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 20:32:35,260 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 20:32:35,261 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:32:35,261 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 20:32:35,261 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 20:32:35,262 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-11-06 20:32:35,262 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 20:32:35,262 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 20:32:35,263 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-06 20:32:35,263 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 20:32:35,263 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 20:32:35,263 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_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f36ecc230238464ca74f9ec244847d47641e99ef3ee219d6c3ec0ed13a7505ac [2023-11-06 20:32:35,547 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 20:32:35,580 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 20:32:35,583 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 20:32:35,584 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 20:32:35,585 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 20:32:35,587 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/array-examples/standard_two_index_08.i [2023-11-06 20:32:38,716 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 20:32:38,916 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 20:32:38,917 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/sv-benchmarks/c/array-examples/standard_two_index_08.i [2023-11-06 20:32:38,925 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/data/24b528d6d/288e262fef8e40bab68cc308c7781f8d/FLAG5281d5792 [2023-11-06 20:32:38,940 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/data/24b528d6d/288e262fef8e40bab68cc308c7781f8d [2023-11-06 20:32:38,943 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 20:32:38,945 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 20:32:38,946 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 20:32:38,946 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 20:32:38,952 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 20:32:38,953 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:32:38" (1/1) ... [2023-11-06 20:32:38,954 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@673f0e0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:32:38, skipping insertion in model container [2023-11-06 20:32:38,955 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:32:38" (1/1) ... [2023-11-06 20:32:38,977 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 20:32:39,141 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_a50f013d-1955-47d0-a704-d807498ff47c/sv-benchmarks/c/array-examples/standard_two_index_08.i[814,827] [2023-11-06 20:32:39,157 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:32:39,166 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 20:32:39,178 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_a50f013d-1955-47d0-a704-d807498ff47c/sv-benchmarks/c/array-examples/standard_two_index_08.i[814,827] [2023-11-06 20:32:39,186 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:32:39,202 INFO L206 MainTranslator]: Completed translation [2023-11-06 20:32:39,202 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:32:39 WrapperNode [2023-11-06 20:32:39,203 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 20:32:39,204 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 20:32:39,204 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 20:32:39,204 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 20:32:39,213 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:32:39" (1/1) ... [2023-11-06 20:32:39,221 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:32:39" (1/1) ... [2023-11-06 20:32:39,242 INFO L138 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 59 [2023-11-06 20:32:39,242 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 20:32:39,243 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 20:32:39,243 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 20:32:39,243 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 20:32:39,253 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:32:39" (1/1) ... [2023-11-06 20:32:39,253 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:32:39" (1/1) ... [2023-11-06 20:32:39,255 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:32:39" (1/1) ... [2023-11-06 20:32:39,256 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:32:39" (1/1) ... [2023-11-06 20:32:39,261 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:32:39" (1/1) ... [2023-11-06 20:32:39,265 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:32:39" (1/1) ... [2023-11-06 20:32:39,267 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:32:39" (1/1) ... [2023-11-06 20:32:39,268 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:32:39" (1/1) ... [2023-11-06 20:32:39,270 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 20:32:39,271 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 20:32:39,272 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 20:32:39,272 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 20:32:39,273 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:32:39" (1/1) ... [2023-11-06 20:32:39,280 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:32:39,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:32:39,307 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 20:32:39,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 20:32:39,362 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 20:32:39,362 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 20:32:39,362 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-06 20:32:39,363 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-06 20:32:39,363 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 20:32:39,363 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 20:32:39,365 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-06 20:32:39,366 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-06 20:32:39,457 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 20:32:39,458 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 20:32:39,606 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 20:32:39,638 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 20:32:39,638 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-06 20:32:39,641 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:32:39 BoogieIcfgContainer [2023-11-06 20:32:39,641 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 20:32:39,644 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 20:32:39,645 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 20:32:39,648 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 20:32:39,649 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 08:32:38" (1/3) ... [2023-11-06 20:32:39,650 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2adffb06 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:32:39, skipping insertion in model container [2023-11-06 20:32:39,650 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:32:39" (2/3) ... [2023-11-06 20:32:39,650 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2adffb06 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:32:39, skipping insertion in model container [2023-11-06 20:32:39,650 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:32:39" (3/3) ... [2023-11-06 20:32:39,652 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_two_index_08.i [2023-11-06 20:32:39,669 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 20:32:39,669 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-06 20:32:39,717 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 20:32:39,725 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=LoopsAndPotentialCycles, 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;@43927c5a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 20:32:39,725 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-06 20:32:39,730 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:32:39,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-06 20:32:39,736 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:32:39,737 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-06 20:32:39,738 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:32:39,744 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:32:39,745 INFO L85 PathProgramCache]: Analyzing trace with hash -1745982706, now seen corresponding path program 1 times [2023-11-06 20:32:39,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:32:39,757 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579617143] [2023-11-06 20:32:39,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:32:39,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:32:39,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:32:40,074 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:32:40,075 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:32:40,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579617143] [2023-11-06 20:32:40,076 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1579617143] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:32:40,077 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:32:40,077 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 20:32:40,079 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279553657] [2023-11-06 20:32:40,079 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:32:40,085 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:32:40,087 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:32:40,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:32:40,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:32:40,134 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:32:40,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:32:40,203 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2023-11-06 20:32:40,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:32:40,209 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-06 20:32:40,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:32:40,217 INFO L225 Difference]: With dead ends: 17 [2023-11-06 20:32:40,217 INFO L226 Difference]: Without dead ends: 9 [2023-11-06 20:32:40,220 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 [2023-11-06 20:32:40,227 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:32:40,228 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:32:40,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2023-11-06 20:32:40,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2023-11-06 20:32:40,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 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) [2023-11-06 20:32:40,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2023-11-06 20:32:40,263 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2023-11-06 20:32:40,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:32:40,264 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2023-11-06 20:32:40,265 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:32:40,265 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2023-11-06 20:32:40,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-06 20:32:40,265 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:32:40,266 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:32:40,266 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 20:32:40,267 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:32:40,268 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:32:40,269 INFO L85 PathProgramCache]: Analyzing trace with hash 276578033, now seen corresponding path program 1 times [2023-11-06 20:32:40,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:32:40,269 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1829236764] [2023-11-06 20:32:40,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:32:40,270 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:32:40,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:32:40,450 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:32:40,450 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:32:40,451 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1829236764] [2023-11-06 20:32:40,451 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1829236764] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:32:40,451 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [178840756] [2023-11-06 20:32:40,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:32:40,452 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:32:40,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:32:40,460 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:32:40,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 20:32:40,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:32:40,559 INFO L262 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 20:32:40,563 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:32:40,581 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:32:40,581 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:32:40,586 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [178840756] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:32:40,587 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:32:40,587 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 4 [2023-11-06 20:32:40,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632025146] [2023-11-06 20:32:40,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:32:40,591 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:32:40,592 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:32:40,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:32:40,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:32:40,594 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:32:40,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:32:40,643 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2023-11-06 20:32:40,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:32:40,644 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-06 20:32:40,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:32:40,645 INFO L225 Difference]: With dead ends: 20 [2023-11-06 20:32:40,645 INFO L226 Difference]: Without dead ends: 15 [2023-11-06 20:32:40,646 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-06 20:32:40,647 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:32:40,648 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 6 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:32:40,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-06 20:32:40,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 10. [2023-11-06 20:32:40,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:32:40,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2023-11-06 20:32:40,652 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2023-11-06 20:32:40,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:32:40,653 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2023-11-06 20:32:40,653 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:32:40,653 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2023-11-06 20:32:40,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-06 20:32:40,654 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:32:40,654 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:32:40,664 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-06 20:32:40,860 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:32:40,861 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:32:40,861 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:32:40,862 INFO L85 PathProgramCache]: Analyzing trace with hash -51261225, now seen corresponding path program 1 times [2023-11-06 20:32:40,862 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:32:40,862 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388629573] [2023-11-06 20:32:40,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:32:40,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:32:40,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:32:40,989 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:32:40,992 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:32:40,993 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388629573] [2023-11-06 20:32:40,994 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [388629573] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:32:40,996 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032243440] [2023-11-06 20:32:40,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:32:40,998 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:32:41,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:32:41,002 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:32:41,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 20:32:41,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:32:41,073 INFO L262 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-06 20:32:41,075 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:32:41,106 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:32:41,107 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:32:41,128 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:32:41,128 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1032243440] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:32:41,129 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1825154606] [2023-11-06 20:32:41,172 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-06 20:32:41,173 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:32:41,178 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:32:41,183 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:32:41,184 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:32:41,772 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:32:41,975 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '164#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|)) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 4) |ULTIMATE.start_main_#t~mem4#1|) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-11-06 20:32:41,975 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:32:41,976 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:32:41,976 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-06 20:32:41,976 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010522993] [2023-11-06 20:32:41,976 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:32:41,977 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-06 20:32:41,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:32:41,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-06 20:32:41,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2023-11-06 20:32:41,979 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:32:42,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:32:42,020 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2023-11-06 20:32:42,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 20:32:42,021 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-06 20:32:42,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:32:42,022 INFO L225 Difference]: With dead ends: 31 [2023-11-06 20:32:42,022 INFO L226 Difference]: Without dead ends: 24 [2023-11-06 20:32:42,023 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2023-11-06 20:32:42,024 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:32:42,025 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 12 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:32:42,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-06 20:32:42,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 14. [2023-11-06 20:32:42,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 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) [2023-11-06 20:32:42,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2023-11-06 20:32:42,030 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 8 [2023-11-06 20:32:42,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:32:42,030 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2023-11-06 20:32:42,031 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:32:42,031 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2023-11-06 20:32:42,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-06 20:32:42,032 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:32:42,032 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1] [2023-11-06 20:32:42,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-06 20:32:42,237 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:32:42,238 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:32:42,238 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:32:42,239 INFO L85 PathProgramCache]: Analyzing trace with hash 490227022, now seen corresponding path program 2 times [2023-11-06 20:32:42,239 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:32:42,239 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626666110] [2023-11-06 20:32:42,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:32:42,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:32:42,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:32:42,434 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-06 20:32:42,434 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:32:42,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626666110] [2023-11-06 20:32:42,436 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1626666110] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:32:42,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1132738976] [2023-11-06 20:32:42,437 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:32:42,437 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:32:42,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:32:42,438 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:32:42,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 20:32:42,522 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-06 20:32:42,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:32:42,526 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-06 20:32:42,530 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:32:42,551 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-06 20:32:42,551 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:32:42,585 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-06 20:32:42,585 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1132738976] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:32:42,585 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1823884017] [2023-11-06 20:32:42,588 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-06 20:32:42,588 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:32:42,588 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:32:42,589 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:32:42,589 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:32:42,934 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:32:43,162 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '312#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|)) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 4) |ULTIMATE.start_main_#t~mem4#1|) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-11-06 20:32:43,162 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:32:43,162 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:32:43,162 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-11-06 20:32:43,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538648704] [2023-11-06 20:32:43,163 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:32:43,164 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-06 20:32:43,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:32:43,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-06 20:32:43,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=106, Unknown=0, NotChecked=0, Total=182 [2023-11-06 20:32:43,166 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:32:43,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:32:43,241 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2023-11-06 20:32:43,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-06 20:32:43,241 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-06 20:32:43,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:32:43,242 INFO L225 Difference]: With dead ends: 54 [2023-11-06 20:32:43,243 INFO L226 Difference]: Without dead ends: 46 [2023-11-06 20:32:43,243 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=106, Unknown=0, NotChecked=0, Total=182 [2023-11-06 20:32:43,244 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 44 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:32:43,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 18 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:32:43,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-06 20:32:43,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 20. [2023-11-06 20:32:43,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 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) [2023-11-06 20:32:43,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2023-11-06 20:32:43,255 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 12 [2023-11-06 20:32:43,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:32:43,255 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2023-11-06 20:32:43,255 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:32:43,255 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2023-11-06 20:32:43,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-06 20:32:43,257 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:32:43,257 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1] [2023-11-06 20:32:43,266 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-06 20:32:43,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:32:43,464 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:32:43,464 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:32:43,465 INFO L85 PathProgramCache]: Analyzing trace with hash 1077845166, now seen corresponding path program 3 times [2023-11-06 20:32:43,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:32:43,465 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [5435691] [2023-11-06 20:32:43,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:32:43,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:32:43,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:32:43,639 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-06 20:32:43,640 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:32:43,640 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [5435691] [2023-11-06 20:32:43,640 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [5435691] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:32:43,640 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635155025] [2023-11-06 20:32:43,640 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 20:32:43,640 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:32:43,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:32:43,642 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:32:43,648 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 20:32:43,747 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 20:32:43,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:32:43,748 INFO L262 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-06 20:32:43,750 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:32:43,821 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-06 20:32:43,821 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:32:43,932 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-06 20:32:43,932 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1635155025] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:32:43,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1224561531] [2023-11-06 20:32:43,935 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-06 20:32:43,935 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:32:43,936 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:32:43,936 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:32:43,936 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:32:44,252 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:32:44,451 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '556#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|)) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 4) |ULTIMATE.start_main_#t~mem4#1|) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-11-06 20:32:44,451 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:32:44,451 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:32:44,451 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 23 [2023-11-06 20:32:44,451 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839838215] [2023-11-06 20:32:44,452 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:32:44,452 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-06 20:32:44,452 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:32:44,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-06 20:32:44,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=425, Unknown=0, NotChecked=0, Total=756 [2023-11-06 20:32:44,455 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:32:44,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:32:44,613 INFO L93 Difference]: Finished difference Result 88 states and 107 transitions. [2023-11-06 20:32:44,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-11-06 20:32:44,614 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-11-06 20:32:44,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:32:44,623 INFO L225 Difference]: With dead ends: 88 [2023-11-06 20:32:44,623 INFO L226 Difference]: Without dead ends: 76 [2023-11-06 20:32:44,624 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=331, Invalid=425, Unknown=0, NotChecked=0, Total=756 [2023-11-06 20:32:44,625 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 79 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:32:44,627 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 42 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:32:44,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2023-11-06 20:32:44,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 36. [2023-11-06 20:32:44,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 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) [2023-11-06 20:32:44,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2023-11-06 20:32:44,642 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 18 [2023-11-06 20:32:44,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:32:44,642 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2023-11-06 20:32:44,643 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 23 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:32:44,643 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2023-11-06 20:32:44,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-11-06 20:32:44,644 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:32:44,644 INFO L195 NwaCegarLoop]: trace histogram [20, 8, 1, 1, 1, 1, 1, 1] [2023-11-06 20:32:44,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-06 20:32:44,850 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:32:44,851 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:32:44,851 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:32:44,851 INFO L85 PathProgramCache]: Analyzing trace with hash -936889138, now seen corresponding path program 4 times [2023-11-06 20:32:44,851 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:32:44,852 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1763372480] [2023-11-06 20:32:44,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:32:44,852 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:32:44,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:32:45,205 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2023-11-06 20:32:45,206 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:32:45,206 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1763372480] [2023-11-06 20:32:45,206 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1763372480] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:32:45,206 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [919054140] [2023-11-06 20:32:45,207 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 20:32:45,207 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:32:45,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:32:45,208 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:32:45,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 20:32:45,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:32:45,343 INFO L262 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-06 20:32:45,351 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:32:45,567 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-06 20:32:45,567 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:32:46,117 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-06 20:32:46,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [919054140] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:32:46,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [997376178] [2023-11-06 20:32:46,120 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-06 20:32:46,120 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:32:46,120 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:32:46,121 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:32:46,121 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:32:46,345 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:32:46,532 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1012#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|)) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 4) |ULTIMATE.start_main_#t~mem4#1|) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-11-06 20:32:46,532 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:32:46,532 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:32:46,533 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 22, 22] total 51 [2023-11-06 20:32:46,533 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182362114] [2023-11-06 20:32:46,533 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:32:46,534 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-11-06 20:32:46,534 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:32:46,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-11-06 20:32:46,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1437, Invalid=1643, Unknown=0, NotChecked=0, Total=3080 [2023-11-06 20:32:46,537 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 51 states, 51 states have (on average 1.196078431372549) internal successors, (61), 51 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:32:46,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:32:46,783 INFO L93 Difference]: Finished difference Result 142 states and 177 transitions. [2023-11-06 20:32:46,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2023-11-06 20:32:46,784 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.196078431372549) internal successors, (61), 51 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2023-11-06 20:32:46,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:32:46,786 INFO L225 Difference]: With dead ends: 142 [2023-11-06 20:32:46,786 INFO L226 Difference]: Without dead ends: 128 [2023-11-06 20:32:46,787 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1717 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1437, Invalid=1643, Unknown=0, NotChecked=0, Total=3080 [2023-11-06 20:32:46,788 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 183 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 183 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:32:46,789 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [183 Valid, 81 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:32:46,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2023-11-06 20:32:46,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 68. [2023-11-06 20:32:46,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.044776119402985) internal successors, (70), 67 states have internal predecessors, (70), 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) [2023-11-06 20:32:46,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2023-11-06 20:32:46,800 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 34 [2023-11-06 20:32:46,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:32:46,800 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2023-11-06 20:32:46,800 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.196078431372549) internal successors, (61), 51 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:32:46,801 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2023-11-06 20:32:46,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2023-11-06 20:32:46,803 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:32:46,803 INFO L195 NwaCegarLoop]: trace histogram [48, 12, 1, 1, 1, 1, 1, 1] [2023-11-06 20:32:46,809 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-11-06 20:32:47,009 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:32:47,009 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:32:47,010 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:32:47,010 INFO L85 PathProgramCache]: Analyzing trace with hash -1875309298, now seen corresponding path program 5 times [2023-11-06 20:32:47,010 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:32:47,010 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558548231] [2023-11-06 20:32:47,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:32:47,010 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:32:47,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:32:47,683 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2023-11-06 20:32:47,683 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:32:47,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558548231] [2023-11-06 20:32:47,684 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558548231] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:32:47,684 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1228059845] [2023-11-06 20:32:47,685 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-06 20:32:47,685 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:32:47,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:32:47,686 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:32:47,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-06 20:32:48,949 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-11-06 20:32:48,949 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:32:48,954 INFO L262 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-06 20:32:48,957 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:32:49,001 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2023-11-06 20:32:49,001 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:32:49,328 INFO L134 CoverageAnalysis]: Checked inductivity of 1254 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2023-11-06 20:32:49,328 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1228059845] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:32:49,328 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1369855373] [2023-11-06 20:32:49,331 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-06 20:32:49,331 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:32:49,331 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:32:49,331 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:32:49,331 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:32:49,606 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:32:49,794 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1794#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|)) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 4) |ULTIMATE.start_main_#t~mem4#1|) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-11-06 20:32:49,794 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:32:49,794 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:32:49,795 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 29 [2023-11-06 20:32:49,795 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945136639] [2023-11-06 20:32:49,795 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:32:49,796 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-11-06 20:32:49,796 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:32:49,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-11-06 20:32:49,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=506, Invalid=616, Unknown=0, NotChecked=0, Total=1122 [2023-11-06 20:32:49,797 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand has 29 states, 29 states have (on average 1.206896551724138) internal successors, (35), 29 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:32:50,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:32:50,151 INFO L93 Difference]: Finished difference Result 213 states and 229 transitions. [2023-11-06 20:32:50,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2023-11-06 20:32:50,152 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.206896551724138) internal successors, (35), 29 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2023-11-06 20:32:50,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:32:50,154 INFO L225 Difference]: With dead ends: 213 [2023-11-06 20:32:50,154 INFO L226 Difference]: Without dead ends: 208 [2023-11-06 20:32:50,155 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=506, Invalid=616, Unknown=0, NotChecked=0, Total=1122 [2023-11-06 20:32:50,156 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 304 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 304 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:32:50,156 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [304 Valid, 78 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:32:50,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2023-11-06 20:32:50,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 82. [2023-11-06 20:32:50,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.037037037037037) internal successors, (84), 81 states have internal predecessors, (84), 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) [2023-11-06 20:32:50,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2023-11-06 20:32:50,168 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 66 [2023-11-06 20:32:50,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:32:50,168 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2023-11-06 20:32:50,169 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.206896551724138) internal successors, (35), 29 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-06 20:32:50,169 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2023-11-06 20:32:50,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2023-11-06 20:32:50,173 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:32:50,173 INFO L195 NwaCegarLoop]: trace histogram [48, 26, 1, 1, 1, 1, 1, 1] [2023-11-06 20:32:50,185 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-11-06 20:32:50,380 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:32:50,381 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:32:50,381 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:32:50,381 INFO L85 PathProgramCache]: Analyzing trace with hash -1291366514, now seen corresponding path program 6 times [2023-11-06 20:32:50,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:32:50,381 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372901738] [2023-11-06 20:32:50,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:32:50,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:32:50,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:32:51,786 INFO L134 CoverageAnalysis]: Checked inductivity of 1527 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2023-11-06 20:32:51,786 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:32:51,787 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372901738] [2023-11-06 20:32:51,787 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1372901738] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:32:51,787 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [531211531] [2023-11-06 20:32:51,787 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-06 20:32:51,787 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:32:51,787 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:32:51,789 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:32:51,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-06 20:32:52,046 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-06 20:32:52,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-06 20:32:52,052 INFO L262 TraceCheckSpWp]: Trace formula consists of 729 conjuncts, 50 conjunts are in the unsatisfiable core [2023-11-06 20:32:52,057 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:32:52,626 INFO L134 CoverageAnalysis]: Checked inductivity of 1527 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2023-11-06 20:32:52,626 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:32:55,146 INFO L134 CoverageAnalysis]: Checked inductivity of 1527 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2023-11-06 20:32:55,146 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [531211531] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-06 20:32:55,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [906600460] [2023-11-06 20:32:55,149 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-06 20:32:55,149 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:32:55,149 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:32:55,149 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:32:55,149 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:32:55,420 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:32:55,632 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2871#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (not (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|)) (<= 2 |ULTIMATE.start_main_~#b~0#1.base|) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) 4) |ULTIMATE.start_main_#t~mem4#1|) (= |ULTIMATE.start_main_~j~0#1| 0))' at error location [2023-11-06 20:32:55,632 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:32:55,633 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-06 20:32:55,633 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 50, 50] total 122 [2023-11-06 20:32:55,633 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359123406] [2023-11-06 20:32:55,633 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-06 20:32:55,635 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 122 states [2023-11-06 20:32:55,635 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:32:55,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2023-11-06 20:32:55,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7756, Invalid=8246, Unknown=0, NotChecked=0, Total=16002 [2023-11-06 20:32:55,646 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand has 122 states, 122 states have (on average 1.1065573770491803) internal successors, (135), 122 states have internal predecessors, (135), 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) [2023-11-06 20:32:56,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:32:56,892 INFO L93 Difference]: Finished difference Result 359 states and 441 transitions. [2023-11-06 20:32:56,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2023-11-06 20:32:56,893 INFO L78 Accepts]: Start accepts. Automaton has has 122 states, 122 states have (on average 1.1065573770491803) internal successors, (135), 122 states have internal predecessors, (135), 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 80 [2023-11-06 20:32:56,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:32:56,895 INFO L225 Difference]: With dead ends: 359 [2023-11-06 20:32:56,896 INFO L226 Difference]: Without dead ends: 327 [2023-11-06 20:32:56,903 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9043 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=7756, Invalid=8246, Unknown=0, NotChecked=0, Total=16002 [2023-11-06 20:32:56,904 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 684 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 266 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 684 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 266 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-06 20:32:56,905 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [684 Valid, 156 Invalid, 549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [266 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-06 20:32:56,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2023-11-06 20:32:56,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 161. [2023-11-06 20:32:56,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 160 states have (on average 1.01875) internal successors, (163), 160 states have internal predecessors, (163), 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) [2023-11-06 20:32:56,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 163 transitions. [2023-11-06 20:32:56,944 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 163 transitions. Word has length 80 [2023-11-06 20:32:56,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:32:56,944 INFO L495 AbstractCegarLoop]: Abstraction has 161 states and 163 transitions. [2023-11-06 20:32:56,945 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 122 states, 122 states have (on average 1.1065573770491803) internal successors, (135), 122 states have internal predecessors, (135), 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) [2023-11-06 20:32:56,945 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 163 transitions. [2023-11-06 20:32:56,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2023-11-06 20:32:56,947 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:32:56,948 INFO L195 NwaCegarLoop]: trace histogram [119, 34, 1, 1, 1, 1, 1, 1] [2023-11-06 20:32:56,962 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-06 20:32:57,148 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:32:57,149 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 20:32:57,149 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:32:57,149 INFO L85 PathProgramCache]: Analyzing trace with hash -1559572079, now seen corresponding path program 7 times [2023-11-06 20:32:57,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:32:57,149 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297961456] [2023-11-06 20:32:57,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:32:57,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:32:57,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:32:59,811 INFO L134 CoverageAnalysis]: Checked inductivity of 7735 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 7140 trivial. 0 not checked. [2023-11-06 20:32:59,813 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:32:59,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297961456] [2023-11-06 20:32:59,813 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [297961456] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:32:59,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064776421] [2023-11-06 20:32:59,814 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-06 20:32:59,814 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:32:59,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:32:59,818 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:32:59,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a50f013d-1955-47d0-a704-d807498ff47c/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-06 20:33:00,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:33:00,320 INFO L262 TraceCheckSpWp]: Trace formula consists of 1440 conjuncts, 121 conjunts are in the unsatisfiable core [2023-11-06 20:33:00,329 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:33:01,933 INFO L134 CoverageAnalysis]: Checked inductivity of 7735 backedges. 0 proven. 7140 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2023-11-06 20:33:01,933 INFO L327 TraceCheckSpWp]: Computing backward predicates...